Some people in the comments were speculating that he took the Vestige formula like Cody.No. Grey Boy bought his power(s) from Cauldron.
Do you know which one's which?Cherish. She has (had; they're all dead, again, yay!) an exceptionally long range on her empathy and was able to develop cryptic impressions of people based on their feelings and those of the people around them. She was able to identify "the buried girl," Noelle, as someone who was confined and a subject of abject fear or grave concern from the hardened criminals around her and her own friends alike. The "arrogant geek" was a tinker locked up in the top levels of the headquarters.
Some are obvious:
The buried girl is Noelle.
The arrogant geek is Colin.
The dog lover is Rachel.
The daydreamer is Labyrinth.
The broken assassin is Oni Lee.
But the remaining three are a bit ambiguous.
The warlord is Hookwolf or maybe Regent.
The scaredy cat is Regent or Panacea.
The crusader is Panacea or Hookwolf.
My bet is that the former is correct for each. Not certain though.