Baldi is a poorly modeled CGI character with an appearance as that of a seemingly bald human figure with long, skinny fingers, pale skin, red lips, and what seems to be a singular brown/orange string of hair on his head. He wears a long-sleeved green shirt, blue jeans, and light brown shoes. Even though he has no visible ears, the description mentions that Baldi has an excellent sense of hearing.
Strangely enough, Baldi's facial expression while chasing the Player, while heavily compressed and distorted, is neutral and not one of anger.