From the Super Mario Wiki
“Bloopy! Bloopity bloo!”
Bloopers (formerly known as Bloobers until Paper Mario) are squid-like creatures that are found in the ocean. They made their first appearance in Super Mario Bros., and various kinds of them have appeared in most Mario games since, normally as enemies. Mario Party 8 was the first game to feature a Blooper as a playable character. Bloopers come in different sizes and colors, though the original variety shown in Super Mario Bros. is white and roughly the size of a Koopa Troopa. They possess varying numbers of tentacles (ranging from four to up to ten visible limbs) of various lengths, which help them move and are in some of their appearances used directly to attack the player. As shown in some games, like the Mario Kart series, Bloopers can survive in and out of the water. The name "Blooper" is a pun on bloop, an onomatopoeia for the sound that comes from the sea.
 Super Mario series
 Super Mario Bros.
Bloopers are one of the most resistant enemies in Super Mario Bros. They only appear in underwater levels, and will follow Mario relentlessly. They can only be defeated by a Fireball. It appears that Bloopers can't touch the ground in Super Mario Bros.. Bloopers were originally white, but Super Mario All-Stars turned them pink.
 Super Mario Bros.: The Lost Levels
Super Mario Bros.: The Lost Levels features a type of Blooper that can fly through the air the same way it swims through the water. This Blooper can be jumped on for 1000 points. They also look slightly different than their seafaring relatives - they take on a pink or peach color rather than their usual white. In Super Mario All-Stars, all the Bloopers are pink instead of white. In Super Mario Bros. Deluxe, the flying Bloober is off-white. They act the same way as they did in Super Mario Bros., however, some Bloopers are found in harder places.
 Super Mario Bros. 3
Super Mario Bros. 3 features two new types of Bloopers: Blooper Nannies and Baby Bloopers. Blooper Nannies behave like an average Blooper, but are followed by three or four Baby Bloopers. She can send her children in every direction making it more difficult to swim, but the children will return to her after a short time. The original Bloopers also appear in the same attack pattern they had in Super Mario Bros.. Just like in Super Mario Bros., in this game Bloopers were originally white, but were turned pink in Super Mario All-Stars.
 Super Mario Sunshine
Bloopers reappear in Super Mario Sunshine, but have a different look. This is the first game in which Bloopers are able to stand on dry land and they also spit out Goop, Spraying them with water stuns them for a short time. Mario can simply jump on Bloopers to defeat them. If one of these Bloopers falls in the water, they disappear in a cloud of smoke. This is quite ironic, given that they lived in the water in previous games. After a Blooper is defeated, it will yield a Coin. Bloopers can be found in Ricco Harbor, Hotel Delfino's Casino Delfino, and Noki Bay. Jumping Bloopers also make their first and only appearance in this game. Bloopers can also come from King Boo's slot machine in Sirena Beach.
In addition, special Bloopers that Mario can ride on called Surfing Bloopers appear. These Bloopers do not attack Mario and are owned by Big Daddy. Green Bloopers are the slowest, but can be steered the easiest. Yellow Bloopers have average speed and average steering. Purple Bloopers are the fastest, but have terrible steering. If Mario runs into a wall while riding one of these Bloopers, he will lose a life, regardless of his current health. Surfing Bloopers are found only in Ricco Harbor.
An extremely large Goop-spitting Blooper known as Gooper Blooper also appears in Super Mario Sunshine. It is first encountered in Ricco Harbor, where it must be battled twice. Later, it must be fought for a third time when it reappears in Noki Bay.
 New Super Mario Bros.
In New Super Mario Bros. they use the same movements as they did in Super Mario Bros. and still can only be defeated by getting hit with a fireball or Star. They only appear in World 3-3. Blooper Nannies and Baby Bloopers also appear in this game. In this game, Bloopers look and act similar to the ones in Super Mario Bros.
 Super Mario Galaxy
Bloopers reappear in Super Mario Galaxy, where they are found in the Buoy Base Galaxy and the Deep Dark Galaxy. If Mario approaches them, they will start chasing him swimming irregularly, like in the other games. They can even chase him to the surface of the water. If they hit Mario, they will damage him and release ink. They can be defeated with a Spin or a Koopa Shell, but could not be jumped on.
 New Super Mario Bros. Wii
Bloopers appear in New Super Mario Bros. Wii at World 4-4 and World 8-4. This game introduces a new ability for Bloopers; they are able to hide behind scenery and in Warp Pipes. When Mario passes by a Blooper, it will quickly shoot out of its hiding spot. Blooper Nannies also appear in this game, and also have this ability. Bloopers are immune to being frozen; if hit by an ice ball, they easily break free from the ice.
 Super Mario Galaxy 2
Bloopers re-appeared in Super Mario Galaxy 2, behaving the same way as in the predecessor. They only appear in Starshine Beach Galaxy. They are found in the deepest body of water that surrounds the largest tower in both missions.
 Super Mario 3D Land
Bloopers re-appear in Super Mario 3D Land, behaving in the same way as they did in Super Mario Galaxy. However, in Super Mario 3D Land, Bloopers cannot shoot ink. Instead, they follow the player around, like in the sidescrolling games. They also have the ability to whirl around underwater. Bloopers can be defeated with a ground pound, boomerang, fireball, tail whip, or as Statue Mario. Additionally, landing on them from above does nothing to the player, but the Blooper is not harmed either.
 New Super Mario Bros. 2
 New Super Mario Bros. U
Bloopers reappear in the Wii U title New Super Mario Bros. U where they act as they did in the predecessors. They have their own level in this game, Blooper's Secret Lair, which is located in Acorn Plains. They also appear in Tropical Refresher in Sparkling Waters.
 Super Mario 3D World
Bloopers reappear in Super Mario 3D World. Instead of having their characteristic swimming pattern, they now turn sideways and charge at Mario's direction when they spot him.
 DIC Cartoons
 The Super Mario Bros. Super Show!
Bloopers, known by their original name of Bloobers, appear in two episodes of The Super Mario Bros. Super Show!: "20,000 Koopas Under the Sea" and "Mario of the Deep". In these episodes, they are portrayed as King Koopa's primary aquatic minions and carry out the bulk of his duties. They are incorrectly referred to as "octopus Bloobers", and one claims he can defeat the Mario Bros. with seven arms behind his back, despite only having six.
 The Adventures of Super Mario Bros. 3
In The Adventures of Super Mario Bros. 3, Bloopers, as well as Blooper Nannies and Baby Bloopers, appear in several episodes of the show, such as in "Mush-Rumors", "Oh, Brother!" and "Recycled Koopa".
 Nintendo Comics System
Several Bloopers made a small appearance in the Nintendo Comics System story Love Flounders, where they are among the group of sea creatures trying to get Mario to become Big Bertha's boyfriend, so one of them will not have to.
 Nintendo Adventure Books
In Leaping Lizards, some Bloopers try to attack Luigi while he is traveling through Water Land, but he avoids them. Later, some more Bloopers appear in a pool of water Luigi falls into while exploring Iggy Koopa's secret lab. The Bloopers spray Sleepy Ink at Luigi, but if he has a Frog Suit he can deflect the goop. After dispelling the ink, Luigi frightens the Bloopers away by making a scary face, and finds a pogo stick they were guarding.
 Yoshi series
Bloopers make an appearance in Yoshi. They are enemies in the A Type part of the game, as well as the B Type. Bloopers are not main enemies in the game, they just make appearances throughout some parts of the game. Blooper's sprite in this game is like its sprite from Super Mario Bros. 3. Many of the other enemies' sprites also are similar to their sprites from Super Mario Bros. 3.
 Yoshi's Safari
In Yoshi's Safari, yellow-colored Bloopers appear as flying enemies who will try to harm Mario and Yoshi by ramming them; these Bloopers must be defeated by blasting them repeatedly with Mario's Super Scope. Also of note, the mech built and utilized by Iggy Koopa in Yoshi's Safari resembles a large Blooper.
 Yoshi's Island DS
Yoshi's Island DS features Bloopers appearing in early stages of World 3, where they will try to attack a Yoshi by hopping up and down in bodies of water. Bloopers can be easily defeated by being eaten, hit by an egg, or jumped upon. Three of them appear in the Aquatic Enemy Exhibit of the Island Museum. Eating them won't make Yoshi produce an egg.
 Super Mario RPG: Legend of the Seven Stars
In Super Mario RPG: Legend of the Seven Stars, Bloopers can be encountered as enemies in The Sea and in and near the Sunken Ship and are called Bloobers, their original name. An extremely large Bloober, known as King Calamari, also appears as a boss in the Treasure Room of the Sunken Ship. In battle, Bloobers have low defense but high attack. As such, they can be easily defeated, but can do a good amount of damage. They also use their Ink Blast ability to do a large amount of damage. Bloobers have a high tendency to flee from battle.
 Mario Golf series
Also note that in Mario Golf: Toadstool Tour, the name "Blooper" appears on the game's various score charts, though no Bloopers are ever seen in the game, not even in Blooper Bay, a course named after them.
 Mario Golf (Game Boy Color)
 Mario Golf: Advance Tour
 Paper Mario series
 Paper Mario
The Bloopers guard specific areas; one is guarding the Shrink Stomp Badge, one guards the upper-West side with the Warp Pipes to Goomba Village, Koopa Village, and Dry Dry Outpost, and one guards the lower-East side with the Warp Pipes to Yoshi's Village, Shiver City, Rip Cheato's hidden room, and the Ultra Boots. Which one he fights when reaching these areas depends on if he's fought any of the others yet; Blooper is always the first one seen, Electro Blooper is the 2nd to find, and the Super Blooper always appears last. While the last two are optional, Mario must obtain the Ultra Boots during Chapter 6, thus requiring at least one Blooper battle.
The regular Blooper is the weakest and smallest of the three Bloopers in the game. One of its more notable features is that it floats, meaning it will have to be jumped on or have a special attack used on it.
 Paper Mario: The Thousand-Year Door
A Blooper appears as the second mandatory boss in Paper Mario: The Thousand-Year Door. This Blooper's tentacles are blocking the way to Petalburg and Mario has to hit its visible tentacle with his Hammer or jump on it. This makes the Blooper angry, causing it to attack Mario. During battle, it hangs off the ceiling, leaving the player to attack its tentacles, thus making this the first game in which a Blooper's tentacles are referred to as such and fought separately. After both the L. Tentacle and R. Tentacle are defeated, it will fall to the ground.
Although Bloopers do not appear as regular enemies in the game, they do appear in Bowser's underwater level. They are enemies that can simply be taken care of by breathing flames at them. After Bowser gets out of the water and is talking to Kammy Koopa, he can be heard saying, "I swallowed a dang Blooper!"
Luigi also has a partner named Blooey, who is a tough Blooper that Luigi accidentally threw into lava during his journey, thinking nothing of it. Blooey supposedly will keep following Luigi around until he gets his revenge, as he states. Blooey appears in Chapter 3. He surprisingly appears in Chapter 8 before the Shadow Queen is beaten, being darker and more forgiving to Luigi. Goombella notes that Blooey is a strange Blooper for the fact that he can live on land. However, Bloopers being able to live on land previously appeared in Super Mario Sunshine.
 Super Paper Mario
In Super Paper Mario, Bloopers appear as somewhat common enemies in the Tile Pool, where they will attack the player by persistently following them and trying to touch them; as Mario and Princess Peach have no useful underwater attacks when the Tile Pool is first ventured through, players will need to use a Pixl or Bowser's fire breath to defeat Bloopers. A very large Blooper known as Big Blooper appears as a boss in the Tile Pool as well. It uses its tentacles to attack and can be defeated by having Bowser breathe fire on the red tentacles.
 Paper Mario: Sticker Star
Bloopers along with their boss Gooper Blooper appear in Paper Mario: Sticker Star, once again floating above ground. After one of the Royal Stickers fell on Gooper Blooper, it turned him and his Bloopers into Poison Bloopers that went on to pollute much of the sea and become hostile. Some even help Kamek separate Wiggler's body segments. They can also be encountered as common enemies.
 Mario Party series
In Mario Party 2, Bloopers, like in the previous game, carry off players that fall in the ocean in certain minigames. Also, a picture of a Blooper is depicted on the central platform of Torpedo Targets, and a Blooper appears as one of the fossilized characters in Crazy Cutter. In the desert area of the Mystery Land board, there is a drawing in the sand in the shape of a Blooper.Mario Party 8, a Blooper is a playable character, unlocked by completing the Star Arena Mode and having Blooper as the opponent in Bowser's Warped Orbit. However, if Hammer Bro. is unlocked instead, the player must play through the Star Arena once more as Hammer Bro.. In the game, Blooper floats like Boo and uses two of his tentacles as arms. Blooper's default partner in this game is Hammer Bro.
In Mario Party Advance, a Blooper appears as the guardian of the Mushroom Beacon, where he challenges the player to the duel minigame Hammergeddon. When the player wins, he gets the game. Blooper also appeared as one of the suspects for the case of who pulled Shroomlock over the side of Sushi Cliff, the others being Cheep-Cheep and Dolphin. It turns out that it was actually Blooper who pulled Shroomlock over the cliff, as he was the only suspect with arms, though he apologized afterward. The ending says that Blooper continues to train at the beacon, getting stronger each day.
In Mario Party 9, a large Blooper appears as the stage boss of the Blooper Beach board. In its boss minigame, Blooper Barrage, players are on a ship shooting cannonballs at it with their cannons, while Blooper jumps out of the water to throw Urchins at the players. When his health reaches halfway, he begins to throw two Urchins at once. When defeated, he appears dazed in the water before exploding. He is one of the minions Bowser uses in Bowser's Block Battle.
Bloopers appear in various minigames in Mario Party: Island Tour.
 Mario & Luigi series
 Mario & Luigi: Superstar Saga
Bloopers make an appearance in Mario & Luigi: Superstar Saga in the Oho Ocean Seabed, where they use their classic style of moving: a zigzagging, odd pattern. These Bloopers attack by running into Mario or Luigi and damaging them. To defend, the Bros. need to Hammer the Bloopers that they encounter.
 Mario & Luigi: Partners in Time
While no Bloopers actually appear in Mario & Luigi: Partners in Time, in the beta version of the game, there was going to be a Shroobified version of Bloopers wearing shoes, but it was removed for unknown reasons.
 Mario & Luigi: Bowser's Inside Story
A Blooper statue called the Sea Pipe Statue is the first boss battle for Bowser in Mario & Luigi: Bowser's Inside Story. Two Blooper sub-species called Dried Blooper and Bubble Blooper are also encountered in the Pump Works in Bowser's body.
 Dance Dance Revolution: Mario Mix
Bloopers also appear as enemies in the game Dance Dance Revolution: Mario Mix.
 Super Princess Peach
Bloopers reappear in Super Princess Peach, where they are found in the Subrella sections of the game. They can be defeated simply by blasting a bubble at them with the submarine. There are also new sub-species of them called Glad Bloopers.
 Mario Kart series
Bloopers are used as an item in Mario Kart DS, Mario Kart Wii, and Mario Kart 7. After the player has launched it, the Blooper will create a large ink blot on the screen of all the drivers who are currently in a higher rank than the player, which obstructs the driving view of opponents and causes CPU characters to swerve around on the track (except in Battle mode, as CPU characters will never swerve around on the battle course). The higher rank a player is, the more ink that gets splattered on them. If used while in first place, it will backfire and cause ink to block the driver's screen (except for Team Battles). To get rid of the ink, the player can use a Mushroom, go on a Boost Pad, or wait for it to go away. Also, in Mario Kart Wii, there is a medium-sized kart called the Super Blooper that is based on a Blooper. Bloopers seem to be replaced in Mario Kart Arcade GP DX by a Scuttlebug-like item that covers the opponents' screens with spider webs. From Mario Kart Wii onward, the Blooper splatters ink much slower than before.
The Blooper also appears in Mario Kart 7 when the player gets the Lucky Seven. It behaves the same way as a normal Blooper when used by the player, but if another driver touches it while spinning around the player's kart or when it is dropped on the track, it will put a single blot of ink on the opponent's screen.
 Mario Hoops 3-on-3
 Mario Super Sluggers
Blooper continues its playable role in the baseball game Mario Super Sluggers as an unlockable character. Blooper is on the Mario Fireballs as a balanced character. To unlock Blooper in Challenge Mode, players should go to the top edge of the dock in Mario Stadium from where the Warp Pipe is and where they saved Baby Luigi. They have to use Princess Peach to find Blooper and for it to come out of the water. Blooper challenges players to a scouting mission before it joins their team roster. The scout mission is to get a double play with it at batting. It also can be unlocked by completing all the practice tutorials. Its bat is solid white with a picture of its eyes on it. Blooper has good chemistry with Boo, Wiggler and Petey Piranha. Blooper's chemistry with Birdo and Hammer Bro. is bad, which is odd considering that Blooper and Hammer Bro were default partners in Mario Party 8.
On a side note, Blooper has the exact same stats as Baby Daisy.
 WarioWare: D.I.Y.
Bloopers appear as enemies of the hero Link in the game The Legend of Zelda: Link's Awakening. These Bloopers look almost identical to the ones in the Mario series. More recently on the Nintendo 3DS, a fishing game played on an AR card includes a Lakitu fishing and catching a Blooper. The player can also catch Bloopers when Lakitu begins fishing.
 General information
Along with swimming through water, Bloopers have a variety of abilities, the first of which, flying, was shown in Super Mario Bros.: The Lost Levels and has appeared in several other games since. In Super Mario RPG: Legend of the Seven Stars, Bloopers were shown to be capable of burrowing through the ground, shooting globs of ink, and blasting opponents with energy beams.
 Notable Bloopers
 Official profiles and statistics
 Paper Mario stats and tattles
 Paper Mario: The Thousand-Year Door tattle
 Super Smash Bros. Brawl trophy
 Names in other languages