Neutral Evil
Has a 1 use Powerful attack. Upon killing a Town member, becomes a Mafia member with the role of the dead Town member. Upon killing a Mafia member, becomes a Town member with the role of the dead Mafia member.
Must become Town or Mafia to win. Killing a neutral results in your own death.
Unsure how to incorporate Coven into this. could perhaps make it a triangle thing coven only where killing town makes you coven and killing coven makes you mafia? Idk but it's a thought.