The third of the Four Temple Guardians. In the English dub, he is Mimi's "twin brother" where he had different plastic surgeries to look older where he claims that he is one minute older than Mimi.
Gyuujirou is often seen piloting a robot suit and first appears where he destroys Mimi's access card upon her defeat and wrecks her deck. He often cheats and relies on deceit in his duels. His constant defeat at the hands of the series' heroes has led him to hate both Shobu and Hakuoh.
Gyuujirou returns in Charge claiming to have turned over a new leaf, but this is quickly revealed to be an act. Gyuujirou forces Hakuoh into dueling before their match in a self-made Duel Masters Battle Arena by taking Aizen and Johnny Coolburns as hostage. As each of Hakuoh's shields are broken, Gyuujirou shocks his prisoners with a hidden trap, as a part of his plan to torture Hakuoh by harming his friends. As a result, Hakuoh vows to defeat Gyuujirou without losing any more shields, and agrees to forfeit if another one of his shields is broken in order to spare his friends. Hakuoh manages to complete the "perfect duel" and defeat Gyuujirou despite his many attempts to cheat. Afterward, Gyuujirou detonates a bomb beneath the stadium and seriously injures Hakuoh so that he is unable to duel him the next morning. With Hakuoh eliminated, he ends up dueling Shobu again and loses. It is revealed that he is also working with Yuu Fua. After he lost to Shobu, Gyuujirou was banished by Yuu Fua and trapped in a room with George which they both escaped in the same episode.
He uses a Water Civilization Deck and later a Wave Striker Deck during his tournament match with Shobu.
He would later return a few years later in Duel Masters VSR as the true identity of DueMa Land President, returning his long absence from the series.
