Chau was a superficially overweight man of seemingly Asian heritage. He was bald, had multiple rings in his ears and his face, arms, and body were covered in countless deep scars.
Chau seems to be a very masochistic man, asking for more of the pain brought by Beretta's whip. He also said that he was envious of his partner, when he was injured.
Chau is much stronger than he first appears to be, getting right back up when told to despite taking noticeable damage from Beretta's specialized whip.