Suzy Johnson

Suzy Johnson is a blatant toddler and was Jeremy Johnson’s little sister, but she was the main antagonist of Candace Flynn and planned to make her and Jeremy broke up and tried to hide her dirty secret from Jeremy by saying baby noises

After the series finale
Jeremy watched the Phineas And Ferb TV show and founded that Suzy bullied Candace. Jeremy gets angry at Suzy breaking Candace’s heart