Fukuma serves as a seasoned editor at Autumn Publishing, managing Ronaldo’s autobiographical novel series with meticulous precision. His composure and unflappable politeness mask an unnerving intensity, his serene smile contrasting with an unsettling presence. He sports waist-length black hair and square-rimmed glasses, typically clad in a tailored black suit while casually wielding a massive battle axe.

After struggling with chronic unemployment caused by his unnerving, otherworldly aura in youth, Autumn Shoten recruited him for his editorial prowess. Tasked with ensuring Ronaldo’s productivity, he employs unorthodox tactics like temporary imprisonment in an iron maiden to enforce deadlines. He strategically cultivates Ronaldo and Draluc’s partnership for its profit potential, enforcing their cohabitation through calculated interventions to preserve narrative cohesion.

A fervent cat lover, Fukuma adorns his workspace with feline motifs and adopts Bosatsu, a vampire cat discovered during a mission. Oblivious to the creature’s discomfort, he commissions a customized iron maiden to contain his reluctant pet. His passion extends to clandestine visits to cat cafes, a habit he discreetly hides from Bosatsu.

Fukuma wields supernatural abilities, including teleportation through dark portals, fluency in an incomprehensible cosmic tongue, and reality-warping skills to breach vampire domains. Proficient with his battle axe, he maintains a veneer of humanity despite eldritch traits—such as preserving his umbilical cord in a sealed jar. His education at Miskatonic University anchors his ties to esoteric lore.

Interactions reveal a dual nature: he balances mentorship with manipulation, motivating Ronaldo with curated fan letters while deploying extreme disciplinary measures. His dynamic with Draluc hinges on strategic incentives and leveraging their collaboration for profit. Though domineering, he displays unexpected devotion to Bosatsu, expressing care through obsessive control rather than empathy.