[Jen's Revenge]

I don't see where any of those characters were evil. Astronema and Ryan only worked eith the enemy of their own free will. But they came around and became good. Kat was a very good person and I liked her better with Tommy than Kim. I can't say I loved the character but she was pretty good.

But on the main topic itself. I don't think Diabolico turned good. If anything he became an anti-hero.