They say the road to hell is paved with good intentions. Perhaps not all villains truly see themselves as so villainous. What kind of cause or event might drag your character down a darker path -- the sort of road that would make them an antagonist where people are justified in trying to stop them? Would they keep going on realizing what they've become and what they have done? Or would they withdraw and retreat from everything? What kinds of things might your character do if they don't stop themselves? Write this villainous version of your character.
I like this blue but can we consider purple :^)