Basic Info
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Real Name
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Unknown
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Age (in beginning of series)
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Unknown, but most likely between 19-23
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Jewelry/Accessories
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Two ring piercings over his left eyebrow
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Fashion style
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American cowboy / punk, flamboyant patterns
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Best Qualities
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Sharp witted, great at evading direct questions, surprisingly competent
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Bad Qualities
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Shameless, impulsive behaviors, apathetic to the world and others, tendencies to elaborately troll
Profile
Ranmaru is the secondary antagonist in Four Corners. He's a wildly unstable and dangerous gang leader hailing from downtown Yokohama. His gang, which doesn’t have a name, is more or less just a group comprised of his lackeys following his orders. Ranmaru is a shameless person who rules his life by simply getting whatever he wants, although his desires can be quite particular—it has to be “interesting” enough for him to care about it. He’s aligned himself with Taisuke Arakawa, although he is rapidly over stepping his boundaries with the man—which is, most likely completely on purpose.
Spoilers for Chapter 6:
It is later shown that his connection to Arakawa is due to drug distribution purposes, where Ranmaru distributes the drugs (methamphetamine) to other youth gangs and is protected by the yakuza as a part of their deal. It's not entirely revealed whether or not Ranmaru consumes drugs himself, although Arakawa seems to believe he is.