Kaibaman, known in Japan as Ally of Justice Kaibaman, is a character version of the card, "Kaibaman", and a Duel Monster Spirit based on the character of Seto Kaiba. He is also the second opponent to have won against Jaden Yuki during the run of Yu-Gi-Oh! GX, the first being Zane Truesdale.
In the anime, it is thought that the card was created by Seto Kaiba, as a homage to himself. This is reflected in Kaibaman's appearance as his clothing greatly resembles that of Kaiba's during the Battle City tournament, and in both the English and Japanese versions of the anime he shares Kaiba's voice actor. He also wears a helmet and Duel Disk modeled on a "Blue-Eyes White Dragon". His long brown hair is neatly arranged and trails past his waist.