Enemy (仇敵；kyuuteki) is a family introduced in CB17. As the name implies, it is a family representing the villains from the collaboration series. Conveniently, all cards in this family are also Purple, the color which frequently represents evilness. So far, only the villains from the Kamen Rider franchise have this family. Despite being under the same family, these cards have little to no synergy with each other, often only relating to each other through means of flavor.