He is henry's brother
The story here is he was just a child when some kidnappers took him and turned him into a killing machine in the years he was abused in order to build up his rage he crafted his sword from raw materials and the wound you see in his right eye appeared because when the time he attacked the kidnappers one of the kidnappers shot his right eye and so then thats how he got it.
Now he is truly pure evil due to what had happend to him. He has a fluffy tail and ears it is Sensative