Suzy Johnson

Suzy Johnson is the arch-enemy of Candace Flynn from the show Phineas and Ferb.

For some reason, she doesn't want any girl other than her to be around Jeremy, her brother. It is unknown why she wants Jeremy to only care for her, despite being already related. Suzy Johnson's biggest role in an episode was "Suddenly Suzy". Also in one episode, when Candace finally gets to have a normal day with Jeremy and not spending the entire day trying to tattletale on Phineas and Ferb, Suzy torments her, including putting squirrels in her pants. However, Candace still has a happy day with Jeremy and Suzy couldn't launch her final attack on Candace because cooked steaks have landed on her in a large pile.

In "One Good Scare Ought to Do It!", it has been shown that Suzy also torments Buford, possibly because he tried bullying her or Jeremy.

Trivia
Though not truly evil and sane, Suzy has similar traits with yandere ,as she is possessive toward her brother. But unlike yandere whom more violent and deadly threat to everyone around her, she is simply a naughty prankster.