My Hero Academia - Scar? Firelord Dad? Rival MC?

At least Endeavor is redeemable . . .
Ok, he's trying to change and make amends and he know what he did was wrong.

No, you're right, it was Todoroki's mom who burned him with boiling water, it was because she had a nervous breakdown for seeing him with half Endeavor's face when she was talking with her mother.

Todoroki never blame her though, he had clear from the get go that was Endeavor's abuse that made her do that.