Wendy O. Koopa

"Hey Mario! Try some of my candy rings, I think you'll be surprised how they taste! (I hope Mario falls for this trick... He doesn't know these sweets are deadly - yet!)"

- Wendy O. Koopa

Wendy O. Koopa is one of Bowser's eight children and his only daughter. She is Bowser's fifth child.

Wendy is, more or less, a spoiled brat with a quick temper, often going into a rage over little things. She is also fairly materialistic and greedy.

Super Mario Bros. 3
In Super Mario Bros. 3, Wendy, along with her brothers, was in charge of taking over the various kingdoms of the Mushroom World; Wendy decided to take over the kingdom of Water Land. Easily taking over Water Land with her Airship and armies, Wendy stole the Magic Scepter of Water Land's king and changed him into a Kappa or a Dino Rhino, depending on the version of the game.

Traveling through the lakes of Water World, Mario managed to reach Wendy's airship. Passing all of Wendy's troops and defenses, Mario made his way into the spoiled Koopaling's cabin. Wendy tried to defeat Mario by tackling him and shooting giant rings of candy at him. After two hits she would try to start jumping around the room (in high heels), while still throwing Candy Rings; these attack were to no avail though, Wendy was eventually defeated.

Super Mario World
In Super Mario World, during Bowser's invasion of Dinosaur Island, Wendy took over Chocolate Island. Venturing inside Wendy's fortress, Mario managed to pass all the skewering defenses inside its walls and reached Wendy's chamber.

In battle, Wendy would utilize the same attack pattern as her brother Lemmy; Wendy would pop-out of a random Warp Pipe with two "Wendy Dolls" popping-out of two other pipes. Mario would have to dodge a wayward Podoboo and bash Wendy on the head three times to defeat her.

New Super Mario Bros. Wii
Wendy and the rest of the Koopalings are set to appear as bosses in the upcoming game, New Super Mario Bros. Wii.

Super Mario anime series
Wendy, as well as her siblings were featured in the Super Mario anime series, a set of three Japanese OVAs. In the Mario retelling of the story "Momotaro", Wendy and her siblings appear as minions of Bowser, aiding him in abducting Princess Toadstool. In "Shirayukihime (Snow White)" Wendy also appears as a minion of Bowser once again, like her brothers, Wendy ends up being beaten by Mario.

Cartoons
In The Adventures of Super Mario Bros. 3 and Super Mario World cartoons, Wendy was renamed Kootie Pie Koopa. Kootie Pie, like Wendy, was a sixteen-year-old spoiled brat, who often whined and complained about everything. Kootie Pie would also throw temper-tantrums when she didn't get what she wanted.

Nintendo Comics System
Wendy was also featured in the Nintendo Comics System and Nintendo Adventure Books. Wendy even had an entire comic dedicated to her called "Fins and Roses", which has her on a misadventure with Stanley the Talking Fish.

Super Mario Adventures
Wendy was also prominently featured in the Super Mario Adventures comic by Nintendo Power. This comic portrayed Wendy as the de facto leader of the Koopalings, being the most responsible of them.

Club Nintendo
In the Club Nintendo comic "Super Mario: Erholung? Nein, danke!", Wendy works as a stewardess for the airline KoopAir. She acts very unfriendly, urging Mario and his fellows to enter the plane and, instead of delivering their meal, simply throwing pizza boxes at them. This comic also hints at Wendy's age, as she explains that she has done this job for 40 years. Wendy appears again at the end of the comic, where she can be seen dancing in a disco.

Mario is Missing!
Though absent from the NES and Super Nintendo versions of Mario is Missing!, Wendy does appear in the PC version of the game. Aiding her family in their plan to melt Antarctica, Wendy guarded a corridor in Bowser's fortress.

Wendy was ultimately defeated by Luigi, who was searching for his kidnapped brother.

Yoshi's Safari
In Yoshi's Safari, after her father takes over Jewelry Land, Wendy decides to inhabit Pipe Island. In her battle against Mario and Yoshi, Wendy would utilize an indestructible shield, pop-out of Warp Pipes and hurl bombs.

In order to harm Wendy, Mario would have to use his Super Scope to knock down a nearby Anvil Man Wendy's head. After doing this repeatedly, Mario would have defeated Wendy.

Hotel Mario
In Hotel Mario, Wendy is the owner and boss of Wendy's Blitz Snarlton Hotel; a hotel with a casino theme. Located in Wendy O's Sweet Suite, Wendy would attack Mario by summoning hearts to open doors and attack Mario. Eventually, Wendy is defeated though.

Mario & Luigi: Superstar Saga
After several years of absence from a Mario and/or Luigi game, Wendy makes a return appearance in Mario & Luigi: Superstar Saga. While Bowletta was invading the Beanbean Kingdom in Bowser's Castle, Wendy acted as a guard in the castle. After solving a small puzzle, Mario and Luigi were capable of battling Wendy.

In combat, Wendy would attack Mario and Luigi by spitting fireballs at them and by flinging her bracelets at them; these bracelets would expand and close around either Mario or Luigi.

Even though she had a Lethal Bob-omb on her side, Wendy was still defeated because of Mario and Luigi.

Personality
Wendy is portrayed as a spoiled brat. She is also shown to be very greedy. This is proven in Hotel Mario. The comics proved she thought of herself as Bowser's favorite child. Her personality in the cartoons had no differences. The in-game text in Super Mario World stated she spent her time in her castle singing.

Physical Appearance
Wendy is the only female Koopaling and has quite a few physical differences from her brothers. She is one of the only two Koopalings to have a pink shell. She strangely has a circular shaped mouth for some reason. She has bracelets on her arms replacing her brothers' and father's spiked collars. She also has a red beaded necklace around her neck. Despite being the only female Koopaling she has no hair and has a large pink bow replacing it.

Bio from The Adventures of Super Mario Bros. 3 Writers Bible
''She's snobbish, spoiled and deceitful, and those are her good traits. A vain teen queen, Kootie Pie despises the princess and her goody-two-shoes ways. King Koopa gives her everything she asks for. He turns into a totally permissive parent whenever Kootie Pie whines "I want!". Anything anybody else has, Kootie Pie wants. And anything she already has, she wants two of. Kootie Pie is not that bright, but has megawatts of intensity and laser-sharp focus. When she gets hold of an idea, she does not let go.''

Trivia

 * Wendy was possibly named after famous musician Wendy O. Williams, lead singer of the punk band the Plasmatics.
 * Wendy is known by being the first female villain in the Mario series, although Birdo, of Super Mario Bros. 2, has been retconned into being female.
 * In most of Wendy's appearances, she copies her older brother Lemmy's attack pattern.