The Mini Sword Ninjas were actually the remanmants of Qwark's MegaCorp days. They were given to Qwark as a farewell gift from MegaCorp. The main branch of these creatures were actually the Lawn Ninjas of the MegaCorp Disposal. During Up Your Arsenal, the Sword Ninja was used as a defense system whenever Qwark returned from a defeat or victory. Later in the game, Sword Ninjas entered small pits that they could hide in; when something came by they jumped up and struck.