Passive: immune to death at night
Night ability: disguise killer, killing one player while pretending to follow another (infinite).
Night ability: Kill a player, while sending guards to another player.(4 uses)
Day ability: The same as the starting king
Idea:
Every natural killer will become a killer king if they are voted as king.
A killer king will be the starting king 1/16 of the games, as any other players.