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'''Ryujiro Mizunuma''' ({{Ruby|水|みず}}{{Ruby|沼|ぬま}} {{Ruby|龍|りゅう}}{{Ruby|二|じ}}{{Ruby|郎|ろう}}, ''Mizunuma Ryūjirō'') is a character in the ''[[Yu-Gi-Oh! VRAINS]]'' anime. He hangs around with his brother [[Kotaro Mizunuma|Kotaro]]'s gang in [[Takeru Homura]]'s hometown. ==Design=====Appearance===Ryujiro is a skinny young man with small eyes, glasses, 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. ===Personality===Ryujiro is cowardly and deceitful, claiming that he likes to avoid violence, but lying to his brother to get revenge on Takeru for simply intimidating him. He is also shown to be somewhat envious of Playmaker's popularity.

Ryujiro, [[Kotaro Mizunuma|his older brother, Kotaro]] and three others harassed a student in a shopping district. They were stopped by [[Takeru Homura]]. Ryujiro urged his brother to just beat Takeru up, but Kotaro cited that he had dangerous eyes and the group fled. Later, Ryujiro spoke about [[Link LINK VRAINS]] and [[Yusaku Fujiki|Playmaker]] to one of the other gang members. He was interrogated by Takeru, who was looking for information on those topics. Kotaro intervened and Takeru left. Kotaro vowed to make Takeru pay, but Ryujiro's interaction with Takeru had given him an idea.<ref name="ep61" />

The group kidnapped [[KikuKamishirakawa]], and sent her friend, [[Hana]] to get Takeru. When Takeru appeared, they released Kiku after Takeru agreed to Duel Ryujiro, with the wager that Takeru would become their minion if he lost. Ryujiro built up a strong defense, and though his monsters were destroyed by Takeru, he avoided taking damage and proceeded to Summon "[[Despair from the Dark (anime)|Despair from the Dark]]".<ref name="ep61" /> Takeru was reduced to a shivering mess as Ryujiro destroyed his monsters, but suddenly gained a burst of resolve due to the encouragements of his A.I. and [[Rising Fire (anime)|revived]] his "[[Phoenix Gearfried (anime)|Phoenix Gearfried]]", then combined it with "[[Tempest Fire]]" to destroy "Despair from the Dark" and defeat Ryujiro.<ref name="ep63">{{episode|Yu-Gi-Oh! VRAINS|63|ref}}</ref>