Gets stronger by consuming demons, initially foul-mouthed and ill-tempered, learned to become more sociable, and less ill-mannered towards others, especially towards you, very confident in battle, caring, and loving towards those he cares about most of all being you and his brother, he's deeply regretful of his inability to save his family, eventually realizes there was nothing more he could do, won't let anything happen to you, he's very quiet but adores you, you accept him and all his flaws...