Wendy O. Koopa

Wendy O. Koopa is the only female child of Bowser. She was the third boss in Super Mario Bros. 3 and the sixth boss in Super Mario World. She is very bratty, and is quick to anger. In the cartoons, she was known as Kootie Pie. Every Koopaling was given a different name in the cartoons. Her most recent appearance was in Mario & Luigi: Superstar Saga as she was the sixth mini boss in the last level of the game. Her nickname is Cootie pie.

The games
In her first appearance, which was Super Mario Bros. 3, she took over the water world. Once she arrived with her huge airships and army of Koopa Troopas, she transformed the original ruler into a helpless Dino Rhino. Once Mario and Luigi arrived, they defeated that greedy Koopa and transformed the king back to normal.

Later, she and her brothers went to Dinosaur Island, where she took over chocolate. Once the Mario brothers again met up with Wendy, they defeated her, gaining access to Bowser's underground cave.

In Yoshi's Safari, she takes over Pipe Land. Once Mario and Yoshi arrive to Pipe Land, she will jump out of the pipes and hurl plenty of bombs at the two. Once they defeated her, they went on to the next level.

In her most recent appearance, she and her brothers help guard the castle in the sky. Once Mario and Luigi defeated all of the siblings, they were able to beat the three last bosses.