Morton Koopa Jr.

Morton Koopa Jr. (known as Big Mouth Koopa in the cartoons) is one of the Koopalings, a clan of seven siblings that act as leaders of the Koopa Troop under Bowser (originally considered his children). Morton stands out because of his primarily darker skin coloration and his white head until New Super Mario Bros. Wii, in which his pale grey shell was also a point of interest due to the Koopalings now having unique shell colors. Morton is named after famed talk show host and singer-songwriter Morton Downey, Jr. This is the reason for the "Jr." at the end of his name, which was a point of confusion when he was first introduced as one of Bowser's children. No in-universe explanation of his name was provided at the time, though the editors of the magazine Nintendo Power once claimed that when they asked Bowser why Morton Koopa was called "Jr.", he denied having any sons, then pelted them with Bob-ombs until they left.

Super Mario Bros. 3
Morton made his first appearance was in Super Mario Bros. 3 where he, along with his siblings aided their father in an attempt to take over the Mushroom World. At some point, Morton discovered that Mario was capable of accessing transformations, which meant Mario might prove to be a challenge, and likewise reported the discovery to Bowser. Morton usurped the king of Desert Land and took over. He used the same attack pattern as Larry, but in the end he was defeated by Mario.

Morton also uses his wand to shoot magical projectiles. Larry, fought previously before Morton, barely used his wand, as what he mainly did was jump. Morton jumps also, and is a slight bit harder to defeat than Larry.

Morton also appears in Airship's Revenge, an optional bonus World-e level for the GBA remake Super Mario Advance 4: Super Mario Bros. 3. Besides Morton, only two other Koopalings are given e-Reader levels: Lemmy and Ludwig. In his level, Morton attacks Mario with a new airship and fights the same way as he did in his original boss battle, complete with wand. After being stomped three times, Morton is defeated once more.

Super Mario World
Morton appeared again in Super Mario World helping his family in an attempt to take over Dinosaur Land. His castle is located in the second area, the Donut Plains. Morton attacks Mario or Luigi by climbing the walls and ceiling of his room and dropping down. Mario or Luigi needs to stomp on his head thrice or shoot a dozen fireballs at him to win. Afterward, Morton's castle was kicked twice by Mario before repeatedly stomped on to cause it to collapse.

Although Morton's official artwork depicts his shell as gray, as with the other Koopalings, his sprites are differently colored: his battle sprites use the green palette intended for the green Koopa Troopas and other lesser enemies, while his cast roll sprite uses the teal palette applied to the Buzzy Beetles' in-game sprites; although a grey palette closer to his artwork exists in the game's graphics, for unknown reasons, it is applied to Roy Koopa's cast roll sprite instead.

New Super Mario Bros. Wii
Morton appears as a boss once again in New Super Mario Bros. Wii.

In the game's intro, Morton, the other Koopalings, and Bowser Jr. use a giant cake to sneak into Princess Peach's birthday party. They use the cake to capture her and then fly away on their airship with Mario, Luigi, Yellow Toad, and Blue Toad following them from close behind.

Morton is fought in World 6 in his tower on a platform with the ends of each side slightly raised up, set in a sea of lava. When Morton sees Mario, he stamps his foot and growls, then begins to fight.

Morton's main method of attack is shooting pink energy blasts that can be targeted in any direction. He can also do a Ground Pound move similar to that of Roy Koopa or a Sledge Bro, that will stun anybody who is on the ground. His pounds last for less time than Roy or a Sledge Bro. Also, Morton's casting speed is extremely slow compared to Roy, but his magic is the fastest in the game, along with Iggy. Whenever Morton is damaged, he will jump into his shell and spin to attack. This attack is faster than the other Koopalings. Fortunately, it can be easily avoided if the player jumps on the raised ground. However, spiked pillars will come down from above and land on the two raised platforms, damaging anyone that they hit. Once Morton has been stomped on three times, he will retreat to his castle.

In his castle fight, it appears it is going to be very alike to the attacks Larry used. Then, Kamek flies in and sprinkles magic. At first, nothing looks different, except the ground has slightly lowered. Then, Morton will then use his immense weight to ground pound and cause the platforms on either side of him to rise up and hit the ceiling. He will jump around and repeat this tactic throughout the battle. Getting squished will defeat Mario and company in one hit. It is strongly noted that Morton never uses his magic in the castle fight, and he doesn't start spinning around as long as the pillars are up. Also, unlike his tower battle, Morton's Ground Pounds won't stun grounded players during the castle battle.

After being defeated, Morton is later seen along with the other Koopalings getting Bowser back up, only to have Bowser's castle fall on top of all of them.

On a side note, unlike in the past titles, players fight Morton after Roy in this game. Also, in Super Mario Bros. 3, he is the boss of a desert world, while another desert world (though still the second world) is given to Roy in this game, and Morton gets a mountain level instead. In addition, neither Roy or Morton get the cloud level, but it is rather given to Ludwig.

New Super Mario Bros. 2
Morton reappears in New Super Mario Bros. 2. This Koopaling is fought similarly to Roy in the predecessor. He is fought in the castle of World 4 and will stomp his foot and growl at Mario, like he did in the previous game. In his battle, he will create Spiked Balls using his wand during the battle and use Ground Pounds to stun all players that are on the floor. Just like the other battles with the Koopalings the player has to jump on him to defeat him. Unlike the other Koopalings, because of the nature of his "boss fight" with Mario, he doesn't spend a limited amount of time in his shell upon being stomped, as he requires a pipe upon being stomped on to return to his position. After three stomps, Morton is defeated, leaving the key to World 5

Morton survived the encounter, and rejoined his comrades at Bowser's castle, where they attempted to petrify Mario with their Koopa Clown Car's petrification device. He also aided Bowser alongside the rest of the Koopalings by causing him to grow larger, but it resulted in him and the others being knocked into a lava pit by Bowser due to his increased size. He and the other Koopalings survived, however, and attempted to help Bowser by airlifting him with the Koopa Clown Car, but this resulted in it crashing due to it being unable to handle the combined weight of both them and Bowser. Morton ended up on his back, also attempting to get himself back up but couldn't due to his large size.

New Super Mario Bros. U
Morton returns in New Super Mario Bros. U as a boss. He is the boss of Layer Cake Desert, much like how he was the boss of Desert Land in Super Mario Bros. 3. Like in Super Mario Bros. 3 and Super Mario World, he is the boss of the second world. Morton is battled in Morton's Compactor Castle. Like Wendy, Lemmy, and Roy, Morton's boss battle involve him using a weapon instead of a magic wand. This time, it is a large hammer that's apparently filled with magic. He will once again stomp his foot at Mario when he sees him before battle. While he still shakes the ground by stomping on it, he'll use his hammer to knock giant Pokey segments in the player's way. He can knock Pokey segments straight at the player or knock them in high arcs. In addition, like most of the Koopalings (except for Roy Koopa and Ludwig von Koopa), Morton also fought the Mario Bros. in the cabin of his ship. Three stomps will have him fall offscreen.

Despite this, Morton survived, and was later picked up along with the rest of the Koopalings by Bowser Jr., although they ended up escaping by hanging onto Bowser's tail after the latter inadvertently destroyed Bowser Jr.'s (already damaged) ship.

Morton has his own personalized airship, with his face on the bow, and his black-colored shell at the deck of the ship. The stern of his ship has a gray color design, similar to his former shell color from past appearances. Like most of the airships, his airship is equipped with a propeller at the back as well as another just beneath the crow's nest. Morton's airship is equipped with four cannons, two on each side, like Roy's ship except that the cannons are placed vertically from each other. There are also grey lids on top of the cannons used for opening and closing the cannons. His airship has the biggest build of all the Koopaling ships. The ship is also made out of a darker wood than the other Airships, a reference to his darker skin tone. The cabin of his ship contains gold-tinted windows, gold Moai statues at the top of the room and a sand pit elevated on a platform.

When Morton's airship appears at the roof of the castle, his voice sounds different from his usual voice. A similar oddity occurs with Roy's and Ludwig's airships.

New Super Luigi U
Morton Koopa Jr. appears in New Super Luigi U. He is battled in the same way as New Super Mario Bros. U, and is found in Morton's Lava Block Castle.

Amada Anime Series: Super Mario Bros.
Morton, along with the other Koopalings appeared in two of the Japan-only Super Mario anime videos. In Momotarō, they try to defend their king's castle, only to be defeated by Mario and his friends in their quest to rescue Princess Toadstool. In Snow White, Morton and the other Koopalings play a similar role, once again, being defeated by Mario as he attacks Bowser's Castle.

Super Mario World: Mario to Yoshi no Bōken Land
Morton appeared in the interactive Anime adaptation of Super Mario World. On Chocolate Island, he, alongside Lemmy, Wendy, Larry, Ludwig, and Roy, ambushed Mario and Luigi at a fortress. He alongside his brothers fought Mario after Wendy nearly fell into lava, but was stomped by Mario alongside Roy. Although they got up, Mario by that time broke open a red block to get a Cape Feather and sent them flying.

DIC Cartoons
In The Adventures of Super Mario Bros. 3 and Super Mario World cartoons produced by Nintendo and DIC Entertainment, he was renamed Big Mouth Koopa (although he was once called "Big Mouth Koopa Jr." on the bonus disc of The Adventures of Super Mario Bros. 3 DVD set released by Shout! Factory, making him closer to his original namesake), ostensibly because he was more talk than action. In fact, he talks so much that someone frequently has to step in to stop his speeches (usually King Koopa or Bully Koopa). He once performed a duet called "Stomp my Name on the Walk of Fame" with Kootie Pie in "Dadzilla".

Aptly, in the Super Mario World cartoon, he occasionally served as an announcer in only three episodes: "Send in the Clown", "Rock TV", and "The Yoshi Shuffle".

There are a few physical differences between Morton and Big Mouth: Morton's shell is gray and in the Super Mario Bros. 3 cartoon, Big Mouth's is purple. Big Mouth has much larger eyes and purple eyelids; the star-shaped birthmark on Morton's face is darker around the cheek, while it's just one solid color on Big Mouth. Lastly, Big Mouth is shorter and thinner than Morton.

Sometimes, Big Mouth's name is spelled as Bigmouth. He was voiced by Gordon Mastern.

The name "Big Mouth" might be a reference to "Loudmouth", a nickname given to Morton Downey, Jr.

Nintendo Adventure Books
In Leaping Lizards, Morton sneaks into Mushroom Palace, vandalizing the throne room and transforming the Mushroom King into a rabbit with his magic wand. If Luigi decides to run ahead of his friends after hearing what Morton is up to, he can find the Koopaling in the midst of smearing peanut butter on the walls, and gets into a fight with him, acquiring his wand before the Koopaling escapes if the reader makes the right choices. Due to not knowing how to use Morton's wand, and thus left unable to change the king back, Luigi proceeds to track the Koopaling to his houseboat in Water Land and breaks in, prompting Morton to call Iggy and the Doom Ship for backup, only to be abandoned by his sibling when the bespectacled Koopaling spots Luigi. Forced to try and swim for it, Morton is eventually cornered and tipped onto his shell, leaving him helpless, on a small island by Luigi, who learns from Morton that the only way the king can be changed back to normal is with a special silver whistle, which Iggy is later revealed to possess.

Three weeks later, Morton and five of his siblings show up as competitors in the International Mushroom Games, where the first prize is Iggy's whistle, which he won by cheating in last years competition. What events Morton participates in besides the Beetlebowl (an all-team contest) are unspecified.

In Koopa Capers, Morton and his brothers have their wands stolen by Wendy, who disappears with them shortly afterward, intent on overthrowing their father with her own army, and a super wand she plans to create by fusing her own wand with her brothers'. If Luigi, who had been coerced by Bowser into searching for Wendy, tracks the female Koopaling down to her hideout, Bowser and the male Koopalings, who had been following him, will barge in after the plumber, but decide to stave off punishing Wendy for her mutiny if she helps search for the hiding Luigi. If Luigi had acquired Boom Boom's socks earlier in his adventure, he can toss them into Wendy's simmering wand combination potion, which will release fumes that knock the entire Koopa family and their minions out for at least a week. During a point where Wendy O. Koopa was about to attack Luigi, a small picture that was supposed to show an angry Wendy O. Koopa mistakenly had a picture of Morton Koopa Jr. instead, even thought he was not in that particular scene.

At an unknown point in Brain Drain, Morton's mind ends up in Toad's body due to Iggy's Synapse Switcher. When Luigi's mind is transferred to Princess Toadstool's body, Morton (who is unaware of the change) tries to trick Luigi into following him to a secluded houseboat by promising him "triple decker lasagna and chocolate chip raviolis". If Luigi tells Morton who he really is, Morton immediately tries to attack him, but Luigi escapes by using the princess's floating ability to cross the nearby Dinosaur Lake. If Luigi instead decides to pretend to be the princess and take Morton up on his offer of snacks, he will be taken to the houseboat, and be ambushed by a group of Koopa Troopas, leading to a Game Over.

Mario is Missing!
Though Morton doesn't appear in Mario is Missing!, his picture is used in the SNES version's manual. In addition, unused quotes attributed to Morton can be found in the original DOS version, suggesting that he was originally planned to be encountered in-game as well.

Yoshi's Safari
In Yoshi's Safari, Morton helped his family invade Jewelry Land and steal the jewels that maintain the stability in the kingdom. Bowser entrusted one of these jewels to Morton, who then watched over the area known as Spirit Mountain. He attacked in a giant, blue, mechanical frog, but Mario and Yoshi defeated him with the aid of the Super Scope.

Hotel Mario
In Hotel Mario, Morton was given the treetop Wood Door Hysteria Hotel to run when the Mushroom Kingdom was once again taken over by Bowser. Here, he held Princess Toadstool captive for a short while, but soon became the first Koopaling battled. At Morton's Tree House o' Pain, he had little defining characteristics. He will wander around open any doors; however, if he finds Mario or Luigi inside an elevator, he will step inside for a moment, then step out and spit the ill-fated plumber's cap on the floor. Fortunately, the Mario Bros. were able to move on.

Mario & Luigi: Superstar Saga
The Koopalings reappeared in Mario & Luigi: Superstar Saga where they guard Bowser's Castle. Morton is the second Koopaling to be fought. Defeating Morton raises a platform, allowing the Mario Bros. to continue on towards Lemmy Koopa.

To get to Morton, Mario and Luigi will have to jump over shockwaves he sends towards the two. High Jumps and Spin Jumps will not work. In battle, Morton has two attacks, sending shock-waves and sending four fireballs at the target (like all the other Koopalings).

Mario & Luigi: Paper Jam
Morton reappears in Mario & Luigi: Paper Jam. He is first seen with Iggy, Lemmy and King Bob-omb on top of Mount Brrr, where they shower the land with new enemies and terrain with the help of cannons. In Bowser's Castle, Morton alongside Lemmy command the Papercraft King Boo, which they use to battle Mario & co., but are soon quickly defeated. He is then seen in Neo Bowser Castle, where he attempts to stop the Mario gang from obtaining one of the fire orbs needed to create Papercraft Fire Mario. Later on in Neo Bowser Castle, after Mario and co. create the bridge leading to the Bowsers, he appears at the end of the bridge with Iggy and Lemmy, telling them to hurry up and push the button in order summon a large cannon that is aimed at Peach's Castle. At the end of the game, on top of Neo Bowser Castle, Morton is encountered one last time along with the rest of the Koopalings, where he is fought alongside Lemmy and Iggy. In his battle, after Lemmy and Iggy get dizzy from their own attacks, Morton attempts to get back at the Mario Bros. by lifting Iggy's Chain Chomp and throwing it at them. Mario and Luigi must use Paper Mario as a trampoline to bounce the Chain Chomp back to Morton. Failing to do so will result in an instant Game Over. Successfully bringing the Chain Chomp back to Morton will cause damage to him and leave him dizzy. He remains dizzy until it is his turn to attack again if he hasn't been defeated. After the battle, Morton utters some last words, where he tells Bowser to forgive them for failing to defeat Mario and the others before exploding.

Mario Kart 8
Morton Koopa Jr., alongside the rest of the Koopalings, appears as a playable character for the first time in Mario Kart 8, where he is an unlockable character. In this game he is voiced by David Cooke. His nickname in a Japanese Nintendo Direct for Mario Kart 8 is ｢無敵のタフガイ」, or "Unrivaled Tough Guy'" (localized as the "Mass of Muscle" or "Invincible Tough Guy" ). His emblem is a white silhouette of his head on a black background in a similar way to Bowser's emblem.

Morton is the heaviest Koopaling in the game, with his greatest strengths being his speed and weight tied with Wario, Bowser, Dry Bowser, and the Large Mii. His other stats can potentially drop to the lowest possible levels, however.

Morton is the Normal Staff Ghost for Bone-Dry Dunes. There are also signs for "Morton Construction" that can be seen in Wii Grumble Volcano as well as in Ice Ice Outpost. In that track, many containers and machines also bear the "Morton" or "Morton Construction" logo.

Morton's main colors for his Standard parts and Pipe Frame are white and grey, and his secondary color is green. The color scheme selection of his other parts is based on his signature black, making it nearly identical to that of Black Miis. An exception to this is his GLA, which is white.

Super Smash Bros. for Nintendo 3DS / Wii U
Morton, along with the rest of his siblings, make their Super Smash Bros. debut as unlockable playable characters accessible via "palette swaps" of Bowser Jr.. He is treated as a separate character, having his own voice, and the announcer calls him by name, but his attacks are identical to Bowser Jr.. Morton can appear in place of Bowser Jr. in All-Star mode, like the other Koopalings. The rim and propeller of his Koopa Clown Car are colored black, his signature color, and has a different face. He is voiced by Lani Minella, however, his voice clips in-game are being reused from his appearance in New Super Mario Bros. Wii. The rings circling the spikes on his shell are a darker shade of grey compared to his previous appearances. The title given to Morton in the Boxing Ring is "The Enforcer" (NA) or "He'll Make You See Stars" (PAL) in the Wii U version.

Puzzle & Dragons: Super Mario Bros. Edition
Morton appears in Puzzle & Dragons: Super Mario Bros. Edition as a Fire attribute character. He's the World 3-Castle and World 3-Airship Boss. Morton will join the player when ★World 3-Airship is completed. His Skill is Morton's Flame, which changes Water Orbs into Fire Orbs and Heart Orbs into Wood Orbs.

Paper Mario: Color Splash


Morton makes his Paper Mario series debut in Paper Mario: Color Splash. In this game, he appears as a boss who has stolen the red Big Paint Star, and is encountered at the top of the Crimson Tower. In combat, he uses his magic wand transformed into a large wooden hammer. In the first part of the battle, Morton stays on a pedestal taken into battle by two Shy Guys, that also aid him in battle, and retreats on his shell as Mario attacks. After the pedestal is blown away by Mario's hammer, Morton directly attacks Mario with the hammer, dealing 8 HP of damage, or by spinning his shell, dealing 12 HP of damage, then, after a while, he calls for two Shy Guys who bring another pedestal in battle and fight with him. Once Morton has received enough damage, he sets his hammer ablaze, drastically increasing its attack power to 48 HP. The fire can be put out using a fire extinguisher Thing card, that leaves only the grip of the hammer intact, decreasing its attack power to 1 HP. Upon being defeated, Morton will allude to his Master ordering him to steal the red big paint star, causing Huey to deduce that someone else was indeed searching for the big paint stars. Unlike in Mario & Luigi: Paper Jam, Morton speaks in a simple, unintelligent manner similar to Lava Piranha from the first game. He also often doesn't realize what is happening until he stops for some seconds to think. Furthermore, like other paper characters, he has black eyes instead of grey eyes.

Other appearances
Morton was originally going to appear in Super Princess Peach, although he was taken out of the final game with the rest of the Koopalings. In the unused sprites, his and Roy's shells are noticeably green instead of their usual black and pink coloration, respectively.

In Mario and Sonic at the London 2012 Olympic Games, the player can unlock a Mii costume based off of Morton's design. Once the player dons it, he or she will inherit Morton's traits and stats. This is true for the rest of the Koopalings.

Physical appearance
Unlike the other Koopalings, Morton has a dark brown skin tone, except for his face, which is white. He also has a unique star mark (although Larry now has a similar marking) on the left side of his face which is centered on his left eye and covers part of his snout and cheek. This is evocative of the makeup of famous rock band KISS, specifically Paul Stanley, a.k.a. "The Star Child". Morton has four, fang-like teeth in the upper corners of both sides of his large mouth; they are the same as Iggy's. He also has a four-ribbed, light, plated belly and a single tan pad on each foot. His shell is black, lined with a white encasing (formerly grey with a yellow encasing), and the multiple, short, spikes are circled with light grey rings.

He has small, circular-shaped gray eyes, like Ludwig's. He has a round head and a large and burly body, making him both taller and broader than most of his siblings. Morton appears to be relatively hairless, except for three, thin, long, black hairs at the top of his head. He also has three-haired black eyebrows that extend off his face like Wendy's. Morton wears the same metal, spiked, cuffs as the other Koopalings.

Personality and traits
Like all the other Koopalings, Morton's personality and traits have been shrouded in mystery, even more so than compared to the other Koopalings. Morton seems to prefer brawn over brains, similarly to Roy. The Super Mario Bros. 3 manual implies that he is astute enough to realize whether there are any possible setbacks regarding defeating Mario and can likewise report the information to Bowser, but the English translation toned down his thoughtful wording and made him seem angry. This is also true according to the Nintendo Player's Guide for Super Mario Advance 4, in which Morton is said to be a grouch with a cantankerous personality. The former characterization also was hinted at in Mario & Luigi: Paper Jam, where, when Iggy and Lemmy were eager to fight the Mario Bros., Morton reminds them that they had just wiped out Wendy, Larry, Ludwig, and Roy beforehand. He also seemed to be very protective of his siblings in the same game, as when Iggy and Lemmy are left disabled due to their attacks on the Mario Bros. backfiring, Morton declares his intention of avenging them. Morton may have an interest in construction, as in Mario Kart 8, there are advertisements for "Morton's Construction" with Morton's face on it. Curiously, in Ice Ice Outpost many containers and machines present the Morton or Morton Construction logo on them, suggesting that his company is collaborating with the Toads of the Toad Polar Expedition 2014-2015. Along with construction, one of his stunts include him flexing his muscles, which may indicate that he likes anything that takes on strength. The fourth installment in the Super Smash Bros. series states that he is proudly more brawn than brains. In Paper Mario: Color Splash, he was depicted as speaking in an unintelligent, simple manner, such as saying "Morton strong! Morton more tons!"

In The Adventures of Super Mario Bros. 3, all the Koopalings were given names to match the personalities they were given and such was the case with Morton, whose name was changed to Big Mouth Koopa. Big Mouth was extremely talkative, to the point of never seeming to know when to stop talking, which continuously forced Roy to interrupt him. According to the bio on the DVD set for The Adventures of Super Mario Bros. 3, he was also extremely arrogant in regards to his intelligence, as well as exceptionally ignorant regarding the actual facts of the world, and he never accepts responsibility for being wrong, preferring to blame others instead. In addition, he was also known to make cutting remarks, which were severe enough to even make his father cry if directed at him. Very few actual Mario games ever gave Morton lines, although unused lines for Mario is Missing!, which would have been used for a planned boss battle against Morton, implied that he was largely sarcastic and wise-cracking.

Powers and abilities
Like Roy, Morton is one of the strongest Koopalings, using his weight to try and crush Mario or paralyze him by using a powerful ground pound, as in Mario & Luigi: Superstar Saga and Super Mario World, which even involved him running up the walls and dropping down from the ceiling. His debut appearance in Super Mario Bros. 3 did not involve his earthquake-causing power, however, and he relied on the standard abilities shared with his siblings to fight, such as jumping and shooting magic blasts, although he generally doesn't use his magical abilities as much as his siblings. In New Super Mario Bros. Wii, he tended to use his magic wand once his enemies were already immobile, and the game also showed that he couldn't actually jump very high, unlike earlier depictions. He also has the ability to shoot spiked balls from his wand, as shown in New Super Mario Bros. 2. In New Super Mario Bros. U, he has a magic hammer that he uses to knock giant Pokey segments at the player. Like the other Koopalings, Morton can breathe fire, and in Mario & Luigi: Superstar Saga, he used some sort of sonic screech against the Mario Bros., which is like Bowser Jr.'s Sonic Roar! Super Ability from Mario Strikers Charged. His bio on the Japanese New Super Mario Bros. Wii website also implies that Morton's strength is dependent on his weapon. In Mario & Luigi: Paper Jam, Morton also was demonstrated to have a degree of superhuman strength, as he was shown effortlessly lifting and hurling a massive Chain Chomp at the Mario Bros. in an attempt to avenge Iggy and Lemmy.

Despite his strengths, his size also resulted in him being unable to get up once he is forced onto his back, as evidenced by the ending for New Super Mario Bros. 2, where he ended up on his back as a result of the Koopa Clown Car crashing.

Sprites relating to his planned appearance in Super Princess Peach implied that he would have inflated himself like a balloon at some point during the battle, as well as spit objects out and charge at her.

Super Mario Bros. 3 Nintendo Power Strategy Guide
Morton Koopa Jr.

Grouchy old Morton waits for Mario in his Airship over the Desert Land.

Bio from The Adventures of Super Mario Bros. 3 Writers Bible
''Big Mouth just can't stop blabbing, and his twisted talent is insult. His cutting remarks can even reduce his father to tears. Big Mouth's got a chip on his shoulder the size of the Doomship. He would never admit he was wrong, even though he usually is. He thinks he knows everything about everything, but what he knows is all wrong, and he always blames the other guy for his mistakes. Big Mouth loves to stir up trouble, and has a needling probing attitude that always gets it. He holds grudges against the whole world.

Mario Kart 8

 * Weight Class: Heavy
 * Stats
 * Speed
 * Ground: 4.75
 * Water: 5.25
 * Air: 4.75
 * Anti-Gravity: 5
 * Acceleration: 2
 * Weight: 4.75
 * Handling
 * Ground: 2.25
 * Water: 2.25
 * Air: 2
 * Anti-Gravity: 2.5
 * Traction: 3.25
 * Mini-Turbo: 1.75


 * Bio: "Morton’s the biggest of all the Koopalings, and he’s not afraid to throw that weight around. One of the Cruisers in the game, Morton’s got serious Time Trial potential for those willing to practice wrangling him around the track."


 * Staff ghost time

Super Smash Bros. for Wii U Palutena's Guidance
Palutena: That's one of the Koopalings, Morton Koopa Jr.

Pit: Hmm. The resemblance to Bowser Jr. is strong.

Palutena: That Koopa Clown Car is the mass-produced type.

Pit: I guess as heir to the throne, Bowser Jr. would get preferential treatment.

Viridi: The relationship between Bowser and the Koopalings is a real mystery.

Pit: I kind of feel bad for them.

Palutena: That's sweet of you but not very conducive to taking them down, Pit.

Super Smash Bros. for Nintendo 3DS/Wii U trophy description
Blue indicates exclusive to the Wii U version.

Encyclopedia Super Mario Bros.
「モートン

クッパ七人衆のひとり. 七人衆でもっとも大きな体を持つ. 」

Morton

''One of the Koopalings. The one with the largest body among the seven.''

Super Mario Memorial Book
「モートン

クッパ7人衆のひとり. 唯一、体の色が茶色で左目のまわりに星形のマークが描かれている. 」

Morton

''One of the Koopalings. The only one whose body color is brown, he has a star-shaped mark drawn around his left eye.''

Quotes

 * 「フムフム. 結構 やってくれるじゃんか. マリオに 変身 されると、どーも手強 くなりそうだ. よし、オヤジに報告 だ. 」 ("Hmmm. You're pretty tricky. If Mario transforms himself, he'll be difficult to beat. Well, I'll report this to our dad.") - Super Mario Bros. 3 Japanese instruction booklet, page 8.
 * "Grrrr. You're pretty tricky. With all of these new moves, Mario will be difficult to beat. I'd better report this to our Dad!" - Super Mario Bros. 3 English instruction booklet, page 9.
 * "Grrr... Mario, I ain't feelin' too good today. My hair looks terrible and I can't be bothered wit' you. So come over here where I can blast you wit' dis here wand. (We'll just see if you can stomp me on the head three times. I may be slower than little Larry, but I'm faster on the draw.)" - The Super Mario Bros. 3 Nintendo Power Strategy Guide
 * "That's Prince Hugo the Huge! The new ruler of Giant Land! They say he's the biggest, toughest, bravest prince ever! Even for a giant, he's a giant." - Sneaky Lying Cheating Giant Ninja Koopas
 * "Yeah, and they're gonna pick you to be their leader! Isn't that always the way? Treat people lousy, dump garbage on their heads and they'll follow you anywhere!" - Recycled Koopa
 * "Have a good time! Have a nice day! Sayonara! So long! Ciao! See you later, alligator! Ciao! Bon voyage! Hasta la vista! Be sure to write!" - Send in the Clown
 * "Let's do an ambush..." - Do the Koopa
 * "You're a royal pain! And we need your cage for our prisoners!" - Sneaky Lying Cheating Giant Ninja Koopas
 * "So you won't be lonely, here's a little something to keep you company!" - Crimes R Us
 * "Stick em up! I am a BAD robber Koopa! I am also a BAD dancer!" - Crimes R Us
 * "Go away, plumber's helper! The only place you'll see your brother's face is on a milk carton!" - Mario is Missing! (unused)
 * "Want an onion bagel with that lock? It's the only lock you'll ever see!" - Mario is Missing! (unused)
 * "Nanny, nanny, nanny! Luigi fell on his fanny! Try again some other time, pipe cleaner!" - Mario is Missing! (unused)
 * "Still burning to find silly ol' Mario? Huh? Oh no! It's a fire flower! Yikes!" - Mario is Missing! (unused)
 * "The gold truth of the matter is, this turtle is only afraid of one thing, and it's one thing you haven't got, buddy! Fire flowers!" - Mario is Missing! (unused)
 * "Dahhhhhhhhhh!" - New Super Mario Bros. series (when defeated)
 * "Whoa-ho-ho-ho!" - Mario Kart 8
 * "Morton!" - Mario Kart 8 (when unlocked)
 * "Heh huh huh!" - Mario Kart 8 (when performing a trick)
 * "Uwhooa!" - Mario Kart 8 (when performing a stunt)
 * "Whoa-ho!" - Mario Kart 8 (when airborne)
 * "Wah-hoo! Yeah!" - Mario Kart 8 (winning 1st place)
 * "Hey! All right!" - Mario Kart 8 (getting 2nd - 6th place)
 * "Augh!" - Mario Kart 8 (getting 7th - 12th place)
 * "Oh ho ho ho..." - Mario Kart 8 (getting 7th - 12th place)
 * "Bwahahaha! I’m gonna stomp ‘em silly." - Mario & Luigi: Paper Jam
 * "That’s it! The fun and games are over!" - Mario & Luigi: Paper Jam
 * "Peach’s Castle is the worst! Peach’s Castle smashed to dust! That don’t rhyme and I don’t care! Master Bowser’s harsh but fair!" - Mario & Luigi: Paper Jam
 * "Guhuhuh... I can't wait to watch this thing destroy Peach's Castle..." - Mario & Luigi: Paper Jam
 * "How ya like that? I messed up your battle cards! Go ahead and cry about it. I'll wait!" - Mario & Luigi: Paper Jam
 * "Gah! I thought for sure that'd make you cry!" - Mario & Luigi: Paper Jam
 * "Lemmy! What are you doing? This is just getting started!" - Mario & Luigi: Paper Jam
 * "Guhuhuh... I knew I could beat ya!" - Mario & Luigi: Paper Jam (when winning against the Bros. and Paper Mario )
 * "Forgive us…Bowser. I mean…Master Bowser…" - Mario & Luigi: Paper Jam
 * "MORTON! WHY MORTON HERE?" - Paper Mario: Color Splash
 * "OH YEAH! DA BIGGUN! BIG OL' PAIN STAR! NEED FIND BIG PAIN STAR!" - Paper Mario: Color Splash
 * "FIND RIGHT NOW, AND FASTLY!" - Paper Mario: Color Splash
 * "NO PAIN STAR FOR DA MARIO!" - Paper Mario: Color Splash
 * "MORTON FIND PAIN STAR!" - Paper Mario: Color Splash
 * "BAD MARIO FIND PAIN STAR! BUT MORTON FIND IT MORE! MORE MORTON'S! MORE TONS! MORTON CRUSH MARIO!" - Paper Mario: Color Splash
 * "MORTON STRONG! MORTON MORE TONS!" - Paper Mario: Color Splash
 * "BRING ME PEDAL STOOL!" - Paper Mario: Color Splash
 * "MORTON ON PEDAL STOOL! LOOK NOW! MORTON SAFE HERE!" - Paper Mario: Color Splash
 * "HIGH PLACE BROKE... LOW PLACE SCARY." - Paper Mario: Color Splash
 * "MORTON IS FIRED!" - Paper Mario: Color Splash
 * "HOT MALLET!" - Paper Mario: Color Splash
 * "FIRE... BROKEN? MALLET GONE... JUST STICK..." - Paper Mario: Color Splash
 * "EAT STICK!!" - Paper Mario: Color Splash
 * "MORTON... MORTON LOSE. BAD MARIO GET PAIN STAR... MASTER ORDER MORTON... SAY GO GET PAIN STAR... MORTON? MORE LIKE... LESTON." - Paper Mario: Color Splash

Trivia

 * Even though Morton Koopa Jr. is considered the largest and heaviest Koopaling as depicted in Mario Kart 8, his jumps in Super Mario Bros. 3 do not cause the ground to tremble, unlike Roy Koopa and the lighter Ludwig von Koopa. He is able to do this in later appearances, however, though they're still less powerful than Roy's.