In Batman: Arkham Asylum, who is the prisoner in the room where Warden Sharpe is caged?

In Batman: Arkham Asylum in the Cell Block room when you rescue Warden Sharpe (And receive the security hacker) there is a prisoner caged in a red straight jacket.

He can't be scanned, doesn't say anything (but makes a strange breathing sound) and seems to be more detailed than other thugs.

Who is this prisoner and does he represent anything?

Solution 1:

He is the winner of the "A life in Arkham" (or "Your face in Arkham", not sure) contest from Gamestop, where the first prize was to have your face in the game:

Pre-order a copy of Batman: Arkham Asylum in any GameStop store between September 8th and October 15th, and you could win a chance to be immortalized inside the infamous Arkham Asylum. One lucky winner will have his or her face and likeness created as an in-game character, locked inside of Arkham Asylum for the rest of their days.

So he's not a known villain, only a player integrated in the game. This explains also why he seems more detailled, he is made from actual photos (of the face, at least).

I can't find correct sources for this, only a few posts on some forums, because the original GameStop page is not valid anymore.