From the Super Mario Wiki
Putts is a human in the Mario Golf series. He had always focused on his future, but since winning the Marion Cup, this focus dwindled. He speaks with an advanced vocabulary and appears as intelligent as Gene, if not as self-absorbed. When he loses, Putts tends to grieve, despite being weaker than the other champions. Eventually, though, he recognizes the caliber of his victorious opponents and overcomes this grief.
In Mario Golf, Putts is a short man with gelled blond hair, a round nose, and beady eyes. He wears a white-collared orange polo shirt, a brown belt, and white pants. His golfing shoes are chestnut brown and his golfing glove is white. His trademark is his glasses.
In Mario Golf: Advance Tour, Putts had fewer design changes than most other characters. He now wears a white-collared coral pink polo shirt and blue jeans. His shoes and glove remain unchanged. His glasses now have a sky-blue colored rim.
Putt's stats in Mario Golf: Advance Tour