Based on Death Note Kira.
He obsessed about justice and extermination of evil people.
He can control somebody to use his skill on somebody else but the controlled person will die next night. Before controlling he must investigate(won't know his role etc.) player which he wants to control.
Target: get rid of Mafia, Serial Killers, Witches and Arsonists. Options: get rid of Vigilantes, Escorts.