Luigi is Mario's taller and thinner little brother from the Mario series. He is the deuteragonist in most games, but has been the protagonist in some games, notably Luigi's Mansion. He is a well known protector of the Mushroom Kingdom. Unlike Mario, Luigi doesn't like going on adventures, and usually shys away from fighting powerful enemies like King Bowser Koopa. Despite being a prominent protector of Princess Peach, Bowser and his minins seem to think little of him, referring to him as Mr. Green Hat. In fact, in the Super Mario Galaxy series, Bowser will be shocked if Luigi challenges him to battle instead of Mario. Originally, Luigi was meant to be exactly like Mario except for his color, but when his popularity grew, he was given a different design and personality.