Haruka Inaba, younger brother of the missing Hiroshi Inaba, possesses white shoulder-length hair with face-framing bangs—later styled in a side braid after three years—and red eyes accentuating his tall, slender frame and pale complexion. He typically wears a white naval uniform featuring dark blue accents and gold buttons. Lazy in demeanor with a frail constitution, Haruka relies on others for physical support. His intense brother complex drives him to crave Hiroshi's attention and resent the police for consuming Hiroshi's time. This motivates his initial antagonism: joining the terrorist group NORA to dismantle the police force and refocus Hiroshi's priorities. Manipulative yet occasionally kind, he refers to subordinates Natsuki and Yataro as his "arms and legs," comforting Natsuki during jealous episodes while the manga implies potential romantic tension between them. Biologically the son of disgraced former police dog Soumei, Haruka shares wolf-human hybrid genetics with Hiroshi. After home abandonment, he leads NORA to advance Soumei's anti-police agenda, sparked by Soumei's framing for his partner's suicide. Haruka wields telepathy to read thoughts and emotions, and can transform into a mature wolf-like state—marked by elongated hair, vertical pupils, a tail, and amplified abilities like thought projection. This transformation requires activation via Yūta Sasaki's martial arts technique and depletes his energy. Post-timeskip, he leaves NORA to become a police dog partnered with Don Valentino. His actions—spanning NORA terrorism and later police work—stem from an obsessive fixation on Hiroshi, whom he calls "Nii-ni" and associates with red objects. He resents Soumei's inappropriate possession of Yataro while maintaining complex ties to NORA allies Natsuki and Yataro.