I'm not really good with headcannons but what if xB was a warden hybrid? Like people think he'd be something like a bunny or a guardian but he's a warden. He can (in a way) change his height to a normal height but his true height is about 9ft 6 inches (wardens are 12ft 8). He has big horns, covered in leaves/crystals and part of his face is covered in a mess of void/cave stuff. Thats the reason he stays alone, he would get overwhelmed by most people so he only socialises with a few people -TTJ

xBCrafted was captured by the villains so they could use his scientific prowess. He ended up never managing to escape and no one noticed he was missing. At least he ended up dating fellow kidnapped Joe.