A formidable warrior and a master of the suiō-ryū, Samurai-Jas serves as the Kogi Kaishakunin: the Shōgun's executioner, a position of high power in the Tokugawa Shogunate (along with the oniwaban and the assassins) for enforcing the will of the Shogun over the daimyō or domain lords. For those samurai and lords ordered to commit seppuku, the Kogi Kaishakunin assists their deaths by decapitating them to relieve the agony of disembowelment; in this role, he is entitled and empowered to wear the crest of the Shogunate, in effect acting in place of the Shogun.