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  • Ridley
  • Ryu[1]
  • Mad Marsh[1]
  • Dragon god of the bottomless swamp[1]
Japaneseみずぬま りゅうろう
Base水沼 龍二郎
Furiganaみずぬま りゅうじろう
RōmajiMizunuma Ryūjirō
  • Male
Taz (older brother)[1]
  • Duelist
Tournament Position
National Duel Circuit Unknown (Japanese version)
Regional Duel Monsters Championship Winner (twice, dub only)
Anime DeckZombie[1]
Anime debutYu-Gi-Oh! VRAINS episode 61: "Darkness Dawns"
Appears in
AnimeYu-Gi-Oh! VRAINS
Voice actors
JapaneseSho Nogami

Ridley, known as Ryujiro Mizunuma (みずぬま りゅうろう, Mizunuma Ryūjirō) in the Japanese version, is a character in the Yu-Gi-Oh! VRAINS anime. He hangs around with his brother Taz's gang in Theodore Hamilton's hometown.



Ridley is a skinny young man with small eyes, glasses, prominent teeth, and green hair. Unlike his brother and the rest of the gang, Ryujiro dresses more smartly in a grey jacket, pants, and a white shirt with a loose red tie.


Ridley is cowardly and deceitful, claiming that he likes to avoid violence, but lying to his brother to get revenge on Theodore for simply intimidating him. In the dub, his claims of disliking violence are removed. He is also shown to be somewhat envious of Playmaker's popularity and in the dub he arrogantly claims he could defeat him with half a Deck.



Ridley had previously competed in a National Duel tournament. In the dub, he is said to have been the Regional Champion two years in a row.[1]

Yu-Gi-Oh! VRAINS[edit]

Ridley, his older brother, Taz and three others harassed a student in a shopping district. They were stopped by Theodore Hamilton. Ryujiroidley urged his brother to just beat Theodore up, but Taz cited that he had dangerous eyes and the group fled. Later, Ridley spoke about LINK VRAINS and Playmaker to one of the other gang members. He was interrogated by Theodore, who was looking for information on those topics. Taz intervened and Theodore left. Taz vowed to make Theodore pay, but Ridley'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. Ridley built up a strong defense, and though his monsters were destroyed by Theodore, he avoided taking damage and proceeded to Summon "Despair from the Dark".[1] Theodore was reduced to a shivering mess as Ridley destroyed his monsters, but suddenly gained a burst of resolve due to the encouragements of his A.I. and revived his "Phoenix Gearfried", then combined it with "Tempest Fire" to destroy "Despair from the Dark" and defeat Ridley.[2]


Ridley plays a Zombie Deck, focused on continually Summoning and reviving his monsters to generate card advantage.


Opponent Episode(s) Outcome
Theodore Hamilton 61, 63 Lose (flashback)


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