Hmm, I'm loathe to accept anyone who was defected from the Darkbrotherhood as in reality one can't leave it, they only do once they die, merely vanishing one day would have them send their own assassins after you to ensure silence of anything you have learned.
However, since he technically didn't join the brotherhood but was trained since birth, much like the shadowscales then I suppose it might be a special circumstance.
On that note, since you were brought up from birth in the Darkbrotherhood, and that is the only life he has ever known it begs the question of why he left?
As well as that if they were trying to make the ultimate assassin, he'd be celibate, what use does he have for sex when he was designed only to take life?
He'd be more like a machine than he would be a man.

Anyway, they're just my thoughts on it, the other gm's will clear up any of their own points and we will convene if anything needs changing, other than that, it's a fairly decent sign up.
It'll be good to have another stealthy person In the group.