Paranoid Gun Owner
A Paranoid Gun Owner (PGO) is a town role that kills any player who targets them for a night action. If that action is a nightkill, both the PGO and the nightkiller die. It is distinct from a Bomb in that a bomb usually kills a player that hammered them, while a PGO does not.
This role is something of a double edged sword because it can kill both scum and town power roles. A mafia-aligned PGO would risk being unbalancing since it would automatically kill non-mafia power roles.