Saiki Kuniharu, father to Kusuo and Kusuke Saiki and husband to Saiki Kurumi, serves as a manga editor at the fictional Weekly Shounen Cognac, a parody of Shueisha. His professional demeanor is characterized by extreme subservience to superiors, including a developed taste for licking shoes to curry favor. Despite self-assessed talent, his editorial input consistently leads to commercial failures, exemplified by his involvement causing a drastic ratings plunge for the manga "Silent Cyborg" within weeks. Colleagues and creators often find his ideas distressing, yet he remains optimistically unaware of their negative impact. Within the family, Kuniharu exhibits recklessness and unreliability, frequently depending on Kusuo's psychic interventions to resolve his errors. He displays a slovenly and submissive attitude, particularly when tearfully begging Kusuo for assistance. His relationship with his father-in-law, Saiki Kumagorou, is contentious; Kumagorou openly despises him, resorting to physical aggression or assigning menial tasks. Kuniharu struggles with deception, as demonstrated by his ineffective lie about Nendou's petrification. He also suffers from hay fever and maintains contact with his mother, who lives separately following his father's passing. Kuniharu met his wife on November 22nd and married her exactly one year later. His initial encounter with Kurumi was indirectly facilitated by Nendou's late father, though specifics are undisclosed. A marital dispute revealed through Kusuo's affection meter showed both he and Kurumi shared an identical love level of 38,689. Despite his flaws, Kuniharu occasionally prompts protective instincts in Kusuo, who defended him from Kumagorou's verbal abuse, indicating an underlying familial bond. His history includes a brief, unrecognized interaction with Nendou's family, unaware of their connection to his past. In "Reawakened," Kuniharu's portrayal remains consistent with prior depictions, focusing on his comedic inadequacies within family-centric episodes.