'"Bruiser'" is a muscular man who is hired by Daniel Ocean to fake beating him up in Ocean's Eleven. Daniel pays him 2 million for his aide. Other than the original 11 and Terry Benedict, he is the only other character to appear in all three films.
As mentioned above, Bruiser is muscular and, in the first movie, wears ripped clothing to make him look tough. He sports a beard, tattoos and is balding slightly.
It is implied that Bruiser is dumb and forgetful, as he punches Daniel in the face even thoughts was hired to fake. He seems to have a big heart, as he has a wife, and she's "pregnant, again."