Very little is known about Grey, nor his Brother-in-Arms, Fox, other then the legends and stories told about them. It is said they are unkillable and more ruthless then the Devil himself.
Grey is very quiet, rarely uttering a word. When he does speak it is better that one listens and does not interrupt as what ever he is saying is probably more important then your current thoughts. He is noted for his brute strength and ferocity in hand to hand combat. Very few are able to equal him in pure physical prowess. A deep intelligence lies hidden behind all of the brawn.
It is said that he and Fox served together before the collapse of the Circle. Afterwards, they took on jobs as mercenaries using their military reputation and building upon it with ruthless efficiency.