Kooper's appearance is similar to that of an ordinary blue Koopa Troopa from Super Mario World (and in later games), except that he wears red arm bands on both hands and a bandana around his neck to distinguish himself from the other Koopa Troopas. He also wears a bandage on his cheek, though it seems like it’s more for style than an injury. He has had adventures with Mario before, but has decided to become a solo adventurer after their journey. He’s a little childish when speaking to others.