I think Gaston would have been a good main character for a hypothetical Beauty and the Beast sequel (or a good D&D PC). He's the inverse of the standard hero - rather than starting out weak but pure of heart, he starts out strong, clever, brave, and charismatic, but also a rotten person. However, he just crossed several lines in a row (literally stabbing someone in the back is pretty bad even by his own standards), nearly died (Disney characters routinely survive falling off of cliffs), and can't go home to a town where everyone knows he's a villain. Can he turn his life around after hitting rock bottom (both literally and figuratively)?

I'd play him as a paladin, for that strength/charisma combination. Maybe he was saved through divine intervention? That could be enough to make him change his ways. A combat-oriented bard might work too; he does sing...