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Rikiga is a well-off man who lives in the west district. He knew Shion's mother, Karen when she was younger.
Rikiga has short, brown hair and is slightly balding. He has a "petite handlebar" moustache and a short beard. His eyes are brown, and he is slightly over-weight.
Rikiga is a relatively enthusiastic man despite living in the west district. He works as a pimp and at one point offers Nezumi a job as a prostitute, which enrages Shion. However, he soon becomes attached to Shion and becomes a loyal ally.
Rikiga is an ex-researcher who worked with Shion's mother, Karan, to build No. 6. He was romantically attracted to Karan, and may still be.
Rikiga is first introduced when Karan instructs Shion to visit him after finding out about her son's whereabouts. Rikiga offers to take care of Shion, but angers him after offering Nezumi a job as a prostitute and the two leave. Later on, he becomes familiar with Shion and comes to care for him, eventually helping him to break into No. 6.
Special Abilities Edit
Shion: Rikiga becomes very attached to Shion, commenting on what a good person he is and going great lengths to help him (an example is offering to buy Shion a new coat when he saw that his was filthy.)
Nezumi: It is shown that Rikiga dislikes Nezumi's rude and sarcastic personality, going as far as to call him an "arrogant prick." But Rikiga does like Nezumi's acting even calling him by his stage name "Eve." Though he does mention that he used to be a fan due to finding out how Nezumi acts while not on stage.
Karan: In the past, Karan had gone to see Rikiga about a article he wrote on No.6 while he was still a reporter. The two had then gotten close, Rikiga going as far as to ask her out, but in the end he got turned down. He still seems to have feeling for her throughout the series.
Inukashi: Rikiga at first doesn't seem to like Inukashi, but in later episodes they risk their lives together when they sneak into the correctional facility. They watch each other's backs and seem to form a friendship by the end of the series.
- Rikiga has a fear of rats, despite being a former fan of Nezumi.
- His appearance may be different in the novels