Kenshirō Daimon is a 36-year-old police officer who serves as one half of a twin brother duo on the force. He is often partnered with his younger twin, Kōshirō, but while they share the same profession and tragic past, their personalities differ significantly. Kenshirō is characterized as a firm, cool, and cynical individual, presenting a stark contrast to his brother’s more talkative and impulsive nature. Despite these differences, he is deeply protective of Kōshirō and frequently acts to mitigate the fallout from his brother’s careless remarks.

The primary motivation for Kenshirō’s actions is rooted in a shared childhood trauma. When they were young, his parents were killed in a hit-and-run traffic accident involving a taxi driver. This event fostered a lasting and deep-seated distrust of cab drivers, which he specifically directs toward the protagonist, Hiroshi Odokawa. While this explains his professional animosity, his most significant actions are driven by a hidden sense of obligation. Kenshirō secretly aids the gangster Dobu after discovering that Dobu’s yakuza boss, Kuroda, funds a foundation that supports children orphaned by traffic accidents—the very same organization that assisted him and his brother following their parents’ death. Motivated by a desire to repay this perceived debt, he collaborates with Dobu by sharing confidential police information, obstructing investigations, and stealing a crucial data chip from Odokawa’s taxi that contained evidence against the gangster.

Within the story, Kenshirō serves as a morally complex antagonist whose secret loyalties complicate the police investigation. His role places him in direct opposition to his own brother, creating the central conflict of their shared arc. His relationship with Kōshirō is the most defining of his character. While he genuinely cares for his twin, his corruption creates an unbridgeable rift between them. When Kōshirō discovers the truth about Kenshirō’s collusion with Dobu, he is ultimately forced to confront his brother’s moral collapse. In a defining moment, Kōshirō chooses justice over blood ties and arrests Kenshirō for his crimes. In a final act of conflicted loyalty, after Kōshirō shoots Dobu during a warehouse confrontation, Kenshirō covers for his brother’s absence to prevent a mandatory firearm inspection.

In terms of abilities, Kenshirō is portrayed as a capable and detail-oriented officer. He demonstrates meticulous attention to his work, as seen when he repeatedly stops to question Odokawa during the investigation. His professional competence, however, is subverted by his personal corruption. Regarding his appearance, due to the protagonist’s condition of visual agnosia, Kenshirō is perceived as a meerkat-like animal. His true human form is never explicitly shown in the series, though he is presumed to look very similar to his twin brother. The film recontextualizes the events of the original series, reaffirming Kenshirō’s role in the narrative’s collective resolution without expanding his personal arc.