[@Dead Cruiser] If you have a full-stop problem with it, that's alright, just let me know so I can work something else out.  

The idea was inspired by Baldr, in Norse mythology, whose mother made every thing(with one exception) in the world promise never to hurt him, leaving him(almost) invincible.  It creates drawbacks that are outlined in the bio I'm writing, and from a meta-gaming standpoint he has at least one specific, tangible weakness I can think of(along with certain strategies to deal with him).