Koopa Troopas (often shortened to plain Koopas and occasionally to Troopas, Japanese ノコノコ Nokonoko) are common enemies in the Mario series. While some are peaceful, Koopa Troopas are usually displayed as foot soldiers of the Koopa Troop under the direct leadership of Bowser. They are considered to be the archetypal Koopas, as they have no special abilities like Hammer Bros. or Lakitu. Since their debut in Super Mario Bros., Koopa Troopas have appeared in almost every game, usually as enemies, but also as playable characters or party members.