From the Super Mario Wiki
Joe is a male, human golfer in the Mario Golf series, first appearing Mario Golf and returning in Mario Golf: Advance Tour. It was said that Joe used to be a disco pro when he was 18, but later turned to golfing. He has managed to keep his flair through the years, though and commonly uses dance terms to describe his skills. Joe is known to be a bit of a showoff, he nonetheless proves that he is a balanced golfer.
In Mario Golf, he was one of four characters that the player could choose from at the beginning of the game and train however the player like. He could then be uploaded to the N64 version for more training.
In Mario Golf: Advance Tour, he defeats Putts for the championship title and becomes the current champ of the Marion Singles Cup. He decides to partner with Putts for the Marion Doubles Tourney. When it is taken by Neil and Ella, Joe tells them to keep training, so one day they could become as good as Kid.
In Mario Golf, Joe has kinky brown hair tied back into a ponytail. He wears an orange-collared yellow polo shirt, a brown belt, and white slacks. His golf shoes are auburn brown and he wears a yellow golfing glove. His trademark is a pair of dark sunglasses over his eyes. There is a green earring on his right ear.
In Mario Golf: Advance Tour, Joe retains his ponytail, earring and his trademark shades. However, he now wears a yellow-collared green polo shirt, beige slacks, brown and blue golfing shoes and a white golfing glove.
 Mario Golf
 Mario Golf: Advance Tour