Dobu, legally named Kyouhei Mizoguchi, is a 39-year-old yakuza enforcer serving under boss Kuroda. His alias derives from the kanji 溝 ("mizo," meaning "ditch") in his surname, Mizoguchi. Initially misperceived as a baboon or gelada due to a protagonist’s visual agnosia, his true human form emerges as another character’s psychological distortion resolves.

A pragmatic strategist, Dobu prioritizes profit and organizational loyalty. He masterminded the 2005 "Donraku eraser" scam, driving Tanaka’s obsessive quest for a rare virtual item, and coerces Shirakawa into surveilling taxi driver Odokawa by exploiting her debts.

His tense rivalry with yakuza peer Yano fuels internal strife, clashing over methods to fund Kuroda’s operations. Dobu despises Yano’s reliance on honey traps and covertly gathers evidence to discredit him.

In the series’ climax, Dobu allies with Odokawa to extract Kakihana from Yano’s custody, though self-interest underpins his actions. A confrontation with vengeful Tanaka culminates in a misjudged gunshot, leaving Dobu wounded and his survival unresolved.

The film *In the Woods* ties broader narrative threads without expanding Dobu’s arc. Supplementary materials reveal his rise under Kuroda’s mentorship, fractured ties with Yano, and a code merging ruthless efficiency with calculated loyalty.

Dobu embodies the yakuza’s moral gray zones—enforcing brutality yet collaborating against mutual threats. His dynamic with Odokawa and Shirakawa oscillates between antagonism and uneasy alliance, governed by a hierarchy-first ethos that subordinates personal morals to clan obligations.