Amemiya Keima♂

The protagonist of the "Otaku Detective Runs!" scenario. A detective in the Shibuya Central Police Station's Public Safety Division, Juvenile Section. 25 years old. He loves games and calls himself a "gamer," but is indignant when people around him call him an "otaku." He has a strong sense of justice, but is also very opinionated, and often rushes ahead without listening to the advice of those around him. He also has a habit of using old expressions in conversation.
He is treated as a problem child at the station, as he frequently hangs out at game centers while on duty, and as such few people at the station tolerate him.
His favorite food is Snow Brand Coffee Milk. His hobbies include digital-related hardware such as computers and games. His special skill is the yo-yo. He is a Libra.

[From Wikipedia]