He is the brother of Suijin and uses a staff as his weapon.
He protects the people he loves, especially his brother. He will give his life to protect his friends and will never fight a battle he cannot win.
He uses a 6 feet long staff that has an opening at the end that can shoot fire spikes out. Only a limited amount can come though, but he usually never uses all of them during one battle.
Him and his brother have been searching for a few years to destroy an evil simply known as Sin. It's a creature whose origins are unknown until events that led them to meet Zero showed them how Sin came to be.