Iggy Koopa is one of Bowser's 8 children and is the fourth oldest. Iggy Koopa is known to be demented (changed to crazed in the GBA version of mario world...) He makes his 3-D apperances in New Super Mario Bros. Wii, and in Slim Thug Mario as a secret boss, as well as the comic adaption of Mario Bros wii the comic.