He is prone to bouts of intense anger and rage, followed by extreme depression over his actions.

Huh.......

I had known he was sad, kind of his thing, but anger is a new concept for me to associate him with.

Tantrum.
Curse.

Pretty angry things.

Everytime he is hit, he can use Tantrum faster...
Maybe what he did before dying was something like that. Destroyed everything and now he feels pity of it. But his personality doesn't change easily, so although he changed his point of view of what he did, he is still kinda like always raging.
Of course, he doesn't remember. But people can feel things although forgotten.