These are the ones I know of right now:
Randal the Vandal
Hank the Shank
Greg and Meg the Dregs
Super Acolyte Bros
Celebrant of Oryx
Terminatorian the Praetorian
Shrek the Ogre (yes, there's an overpowered Ogre,)
Urzok
Any others?
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Acolyte bros in the Rasputin mission are better. Have someone stay outside the room where you first find omnigul to keep the door open. Someone else gets the cp started. Boss ass acolytes show up outside the room.