Katsuya Mabuchi is a Rank 1 investigator in Division II and a familiar fixture at Itsuki Marude's side. A former engineering prodigy turned professional gamer, he brings sharp strategic instincts to the CCG and later heads the intelligence arm of Tokyo's Security Committee.
Messy brown hair and a set of prominent buck teeth make him easy to pick out. He usually turns up in a white shirt paired with a black tie.
Most of the time he keeps things businesslike, though a careless streak surfaces now and then. His own will summed him up bluntly: he had died, wanted no funeral, and was signing off.
Mabuchi started out as a promising information-engineering student at Teihou University and a talented programmer, until his focus drifted toward video games. He climbed to fame in competition, excelling at shooters and strategy titles and steering his team to a national championship. Marude noticed him during this run and pulled him into Division II. He joined the campaign against Aogiri Tree in the 11th ward, traced the anonymous tip that exposed the 11th Ward Base back to Hideyoshi Nagachika, and worked beside Hide on Marude's command staff during the Owl Suppression Operation, weighing each faction's strengths and issuing orders. In the years that follow he rises to lead the TSC's intelligence department, still aiding Marude and helping keep Tokyo peaceful even after his mentor retires. On the field his gift is coordination: he slips into a focused trance, typing rapidly while relaying objectives to the units.

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Katsuya Mabuchi is a Rank 1 CCG investigator in Division II, a former engineering student and professional gamer who serves as a trusted aide to Itsuki Marude.
Before joining the CCG, Katsuya Mabuchi studied information engineering at Teihou University and became a nationally competitive professional gamer, excelling at shooter and strategy titles until Itsuki Marude recruited him into Division II.
During the Owl Suppression Operation, Katsuya Mabuchi worked on Itsuki Marude's command staff alongside Hideyoshi Nagachika, coordinating strategy and relaying objectives to the units in the field.
After his CCG career, Katsuya Mabuchi rises to lead the intelligence department of the Tokyo Security Committee, continuing to support Itsuki Marude in keeping peace in Tokyo.
Katsuya Mabuchi's greatest skill is coordination in the field, where he slips into a focused trance and types rapidly while relaying commands and objectives to allied units.
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