Giuseppe is very shy and nervous compared to his brothers.
Giuseppe was adopted by Goku and Pikachu at the same time as Mario and Luigi were. He grew up with them. He never found that his father is Geno Garfield (the god who created the universe) and that he will one day have to take his place as ruler of the universe.
Giuseppe was once falsely convicted for the murder of Atticus Finch and spent an unknown number of years in jail.