Kahkki, Guerilla of Dark World, know as Assassin of the Dark World - Kahki in the Japanese version, is a character version of the card "Kahkki, Guerilla of Dark World". He appeared in Yu-Gi-Oh! GX as a Duel Spirit, who was part of the Dark World Army. He appears in the video game Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator as an unlockable opponent.