Tadashi "Kaido" Nikaido

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VA: Kentaro Ito (Drama CD), Yasuhiro Mamiya (Overclocked), Travis Willingham (English)

Known as Kaido, he is the leader of a gang called the Shibuya Daemons. Although he appears intimidating, he is known to be quite helpful. He strives for world domination and has a lingering crush on Mari.

Source: Wikipedia