The hero is very morally good. But an absolute psycho.

1. Optimus Prime. guy will say that humans need to be protected and looked after from the decepticons, makes wise speaches, believes in peace. but you will know when he's absolutely had enough. He rips the fallen's face off. After blasting Megatron with his own gun and snapping his arm. Then in DOTM punches Shockwave's guts out with knuckle-dusters. Then rips his eye out.

2. Doom Slayer. Guy wants to defend humanity to the end. And is married to Isabelle. And had a pet rabbit, and is gentle towards humans even if they aren't on his side. But every mortally-challenged around him is fucked if he runs out of ammo.

3. Arkham batman, arkham batman will save your dying wife, but not before punching you until your face is cracked open if you've annoyed him too much