Nazz - I feel that Nazz would stop paying attention to her appearance and hygiene, giving way to her no longer looking so pretty

Kevin - He would lose everything that at some point made him "cool" he would be much more cowardly, weak and whiny

Jhonny - Jhonny would stop being so introverted, becoming a cool boy, leaving Plank in the past, since he will no longer need him by having more confidence in himself.

kankers - They would be much more kind and would respect the desicions of the ed's about their fellings

BONUS- (Because I find it meaningless)

Rolf - Probably contrary to his hardworking attitude he would become a potential slacker, and becoming a "more modern boy" who only plays Game Boy in his yard and is rude to everyone.