Happy Boy is a very childish and whimsical being. He obsesses over his friends, or who he calls his friends at least, and his thought process is very... unstable, frequently misspelling words and always wanting to play "games" that he makes up. Usually these "games" are complete nonsense, having stock Mario renders plastered all over them, or are just not very engaging. Happy Boy doesn't mean any harm, usually loving anybody he encounters, even people who hate him.