Ronaldo, born Hideo Kinoshita, works as a vampire hunter in Shin-Yokohama. His nickname emerged during high school when a teacher misread his hastily scrawled name, prompting a classmate to jokingly dub him "Ronaldo"—a title that eclipsed his birth name. He idolizes his older brother Hiyoshi, a former vampire hunter turned captain of the Vampire Control Division, believing Hiyoshi retired honorably after an injury. Unaware that Hiyoshi’s departure masked a vampire-linked scandal, Ronaldo pursued hunting to emulate his brother’s perceived legacy. With white-silver hair, piercing blue eyes, and a muscular frame, Ronaldo dresses in a red jacket adorned with a shawl, black gloves, boots, and a hat mirroring Hiyoshi’s style, accentuated by a yellow triangular earring on his left ear. He wields a revolver for flair and an automatic pistol for efficiency, though he frequently brawls or grabs makeshift weapons like fly swatters. His aversion to plain underwear leads him to flaunt bold patterns, and he reacts explosively to celery, detesting its mere presence. Brusque yet thorough, Ronaldo barks at clients but executes missions with precision. His partnership with vampire Draluc began after demolishing the latter’s castle during a botched child rescue—the "hostage" was merely playing games. Compelled to house Draluc and his armadillo familiar, John, Ronaldo begrudgingly relies on their coexistence. He dotes on John, shielding the creature over Draluc, yet gradually tolerates the vampire’s culinary skills and camaraderie amid constant bickering. Hot-tempered and crude, particularly toward Draluc, Ronaldo masks vulnerability beneath aggression. He cries easily when emotional or excluded and berates himself as a "maggot" during creative slumps—a self-deprecating habit from youth. Despite acclaim for *The Ronaldo Chronicles*, his autobiographical novels, he battles writing insecurities, haunted by deadlines set by his stern editor, Fukuma. Ronaldo maintains close bonds with fellow hunters Satetsu and Shot, respects guild leader Gousetsu, and endures celery-themed taunts from dhampir rival Tou Handa. Overprotective of his independent younger sister Himari, he clashes with her self-reliance. Though abrasive, he demonstrates loyalty to allies, even accommodating Draluc’s antics for mutual gain. Future glimpses reveal Ronaldo decades later, still sharing his home with Draluc and John, their camaraderie enduring. His journey reflects growing acceptance of vulnerability—acknowledging Draluc’s place in his life and confronting doubts about his legacy as both hunter and writer.