Suzy Johnson is a antagonist of Disney Channel animated series, Phineas and Ferb. She is the little sister of Jeremy Johnson and the archenemy of Candace Flynn. She has a high-pitched squeaky voice and appears very cute, innocent and beautiful. Despite her cuteness and beauty, she is actually very manipulative and spoiled. She always has to get her own way and will do anything to keep Candace away from her brother.
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.