Francis

Francis is the school bully of Dimmsdale Elementary School. Timmy Turner is a frequent target of his bullying.

Chronology
Francis made his first appearance in the episode The Big Problem, the first episode of the regular series. In this first appearance he's teasing Timmy for his short height by holding his pink cap just out of reach, forcing Timmy to jump up and down to try to get it. From there on, he got progressively more aggressive.

Role in Wishology
Francis didn't have a very big role in Wishology. In the  The Big Beginning, he makes a cameo in one of the early scenes and in The Final Ending, he appears in Timmy's dream sequence.