From the Super Mario Wiki
“Hey, while we're young!”
Charlie is a human golfer in Mario Golf for the Nintendo 64. Wind does not affect his drives as much as any other player. Charlie wears a yellow shirt, a pair of jeans, and brown shoes. He appears to be a teenager who is possibly trying to become a great golfer (similar to Plum). He is also a starting character along with Peach, Plum, and Baby Mario.