Amnesiac cop/seer: acts like normal seer, but doesn't get results, they are instead passed on to another villager. Could be one or several villagers.

Serial killer: solo team, gets a kill every other night just like wolves, immune to wolf kill and maybe kills wolf when attacked. Interesting dynamic in the game for the wolves to know a players role, need said player dead but be unable to kill him and have to get him lynched.

Gunsmith: needs to be a mafia game, not werewolf. Gunsmith has a,lookup each night and will know if said player has a gun. Needs to have mafia, vigilante, cop(seer), FBI agent(hunts serial killer) and/or army vet(takes out mafia member on death) role as well to make role worthwhile.

Maybe a few more but on phone and got bored of typing.