I have a player in my group who knows a fair amount about the 40K universe , and has told me that he would like to make an Alpha Legioannare as a black shield. His back story is that prior to the landing site massacre at Iistvan he was laid low and was in his sus-an induced sleep. The rest of my kill team has just completed a home written story and I planned on having the Omega Vault open to contain an extremely rare FULL suit of Mark 8 power armour but I was introduced to this new roleplayers and he collects Alpha Legion in the TT so I thought, why not bring him in using the Omega Vault?
Basically, after hypno-therapy and being outfitted with Mark 7/8 armour (after being declared free of any warp taint of course) he is assigned to th squad who's mission it was that released him from the Omega Vault. The characters have been notified of the discovery of a Legionnare in the Vault but he has yet to be created or introduced. Another reason I would like to include this unusual character in the game is because I believe it would lead to some interesting plot hooks. The Alpha Legion discover the existance of one of thier brethren from before the heresy as would like him back, or maybe some rogue Inquisition assets desire him for expermentation?
The question I really want to know is how would you stat a character like that? And would you impose any restrictions or limitations on the character? I think insanity points are a given, but how many would you reckomend?