Dobu, legally known as Kyouhei Mizoguchi, serves as a high-ranking yakuza enforcer under boss Kuroda, his ruthlessness earning him the moniker “Dobu”—derived from the kanji 溝 (ditch)—a nod to his shadowy dealings. Profit drives him to orchestrate extortion rackets, financial scams, and brutal debt collection, funneling wealth into his syndicate.

Notably, he spearheaded the Donraku eraser scam against Tanaka, adopting the alias “ditch-11” to ensnare victims online, while simultaneously coercing Miho Shirakawa into pilfering medical supplies to settle her debts. His ventures frequently clash with rival factions, particularly the porcupine-themed gangster Yano, though their friction remains transactional, devoid of personal vendettas.

A pivotal twist redefines Dobu’s feral demeanor: his animalistic traits stem not from biology but from protagonist Odokawa’s visual agnosia, which warps human faces into animalistic visages. This revelation underscores Dobu’s humanity, reframing him as a calculating criminal in an otherwise ordinary underworld.

The official guidebook delves into his past via a 2019 short story, where Yano recounts their first encounter in a rap verse, shedding light on Dobu’s ascent through yakuza ranks. His machinations peak during the missing girl investigation, culminating in a violent showdown that unravels his schemes and exposes his central role in the criminal web.

Dobu’s arc adheres to a coldly pragmatic ethos, prioritizing profit over loyalty or mercy. No moral redemption alters his trajectory, cementing him as a relentless force within the series’ cycle of crime and consequence.