Neutral Evil. This is a person possessed and controlled by dead spirits. They wake up at night if there are at least 3 (?) dead in the graveyard, and they let the dead players vote a living player for the Possessed to attack at night. They can't vote anyone. The vote of a non-Townie role counts as 2 votes. If there are equal votes, no one dies. The attack of the Possessed is unstoppable and gets through night immunity. If they attack a Veteran, they both die; if they attack a player guarded by the Bodyguard, three of them die; if they attack a player healed by the Doctor, the target dies etc. If the Possessed dies, he loses. To win, he must survive until the end of the game alongside any role or faction that wins with Jester/Executioner alive(?). Or he needs to kill all 3 targets voted by the majority of a specific alignment, like, if he only killed 2 targets voted by dead Townies and 1 voted by dead Mafia, he can't win. So he also has to be careful whom he sends to the graveyard in day! A very intriguing challenge if you ask me! Appears innocent to Sheriff.
All factions will want to take advantage of the Possessed when they are the majority in the graveyard, but also another team will want to lynch them to make sure that they won't be used by the rival faction. The Possessed has to have a political balance of which roles or factions it supports in order to avoid getting lynched, and he needs to join smart lynches at day, because at night he is completely under the command of the dead majority who might lead them to their ruin.