Goblin Slayer - Didn't see anyone else make anything like this so I thought I'd try

Plot twist: They're the same person; instead of dying, they force themselves to reincarnate through sheer force of rage.

Outside individual : "Is it really okay for the three of you to slaughter indiscriminately? I mean, I'm not pointing any fingers, but some of you killed children! Sure they weren't human but still…."
The Trinity of rage : "It's okay, we men, manly men…"