Regretful Sheriff Vigilante
Has the power to either investigate one player and find out their alignment, or kill one player. They cannot perform the same action two nights in a row and if they shoot a townie, they are not allowed to perform an action the following night.
Notes: The punishment for killing a townie can be tinkered with; for example, maybe taking away killing powers if they kill one, or taking away both powers. It really depends on the balance of the setup.