http://dbd.game/killswitch
The Horde - Killer Power Suggestion
Now that you have the programming with the twins to switch between two (or more) killer bodies, here is my suggestion:
The Horde - A zombie killer
4 Zombie Husks will shamble around the map. Only 1 is actively controlled by the player.
Ctrl - Player can switch which Husk he or she is actively controlling.
M2 - Frenzy the Horde - All Husk start lurching towards the nearest survivor. If a husk not controlled by the player reaches a survivor, they must struggle to free themselves with an 5-8 second struggle time.
A version of this could be implemented with a Five Nights At Freddy (FNAF) licensed killer, by the way.
All the animatronic Husks wander the map and creepily watch the survivors (like in the FNAF games), M2 could cause them to scream and rush at a survivor. Glowing red eyes could indicated the killer, and the switching power makes sense with the spirits and lore of FNAF.