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  • Taz
Japaneseみずぬま こうろう
Base水沼 虎太郎
Furiganaみずぬま こうたろう
RōmajiMizunuma Kōtarō
  • Male
Ridley (younger brother)[1]
Anime debutYu-Gi-Oh! VRAINS episode 61: "Darkness Dawns"
Appears in
AnimeYu-Gi-Oh! VRAINS
Voice actors
JapaneseMasaaki Yano

Taz, known as Kotaro Mizunuma (みずぬま こうろう, Mizunuma Kōtarō) in the Japanese version, is a character in the Yu-Gi-Oh! VRAINS anime. He leads a gang of delinquents in Theodore Hamilton's hometown.



Taz is larger and stockier than his brother Ridley, but shares his small eyes. He has neck length brown hair with a yellow top, and wears a dark green jacket and pants over a white collared shirt and an orange undershirt.


Taz is thuggish, assaulting a student for personal possessions, but seems to care deeply for his younger brother Ridley to the point of attacking Theodore Hamilton for scaring him, despite his own uneasiness of Theodore. Taz is also somewhat cautious, noting Theodore's dangerous eyes and initially leaving him alone.


Yu-Gi-Oh! VRAINS[edit]

Taz, Ridley and three others harassed a student in a shopping district. They were stopped by Theodore Hamilton. Ridley urged his brother to just beat Theodore up, but Taz cited that he had dangerous eyes and the group fled. Later, Theodore interrogated Ridley, and Taz intervened and Theodore left. Taz vowed to make Theodore pay, but Taz's interaction with Theodore had given him an idea.[1]

The group kidnapped Kiku Kamishirakawa, and sent her friend, Hana to get Theodore. When Theodore appeared, they released Kiku after Theodore agreed to Duel Ridley, with the wager that Theodore would become their minion if he lost. Taz warned Theodore that his brother had competed in a National Duel tournament before. He was concerned when his brother's monsters were destroyed, but he was surprised when no damage was done.[1] Unfortunately, Ridley was eventually defeated.[2]


  1. a b c Yu-Gi-Oh! VRAINS episode 61: "Darkness Dawns"
  2. Yu-Gi-Oh! VRAINS episode 63: "Scare Tactics"