Oathbreaker would be good.
Assassin/gloom stalker ...Killer for hire basically. Go Drow Lolth-sworn for bonus points? lol
Serve an Evil God as Zentu said.
Play Necromancer Wizard Raising dead is always fun.
Bard has some very good dialogue options ... not really evil one just funny.
Barbarian and Fighter both have extra dialogue options that basically say "touch me, I dare you"
Hope this helps?
