I've created his powers (the father Alexander Anderson-type power of creating blades), so now all I need is his name...and also, his fundamental reason for being the way he is. That one's actually the larger hurdle. I really want him to be a character in the story, but I'm not sure what sort of goal he's actually working towards.
It's alright not to know to begin with, but I have to know eventually, and have what he wants make sense with all his betrayals throughout the whole story. Still working on that, but if I pull it off, I'll have an interesting addition to the cast!