Amano Jyaku is a demon-human hybrid originating from the realm of Man-Beasts or demons. In the manga continuity, he is the son of a human and a demon. The Great Elder banished him to Earth as punishment for misdeeds primarily involving the Elder's daughter, Mimi. His exile includes a mission to locate the Chōjin, an all-powerful entity destined for rebirth within a human host and prophesied to unite the worlds. His personality and actions diverge significantly between manga and anime adaptations. The manga depicts him with lecherous, manipulative, and unsympathetic traits. He tricks women into sexual encounters by falsely claiming his sperm possesses demon-fighting properties, displaying a self-serving nature driven by personal gratification. Conversely, the anime portrays him with a more heroic and noble demeanor; he genuinely believes in the Chōjin's prophecy to peacefully unite the three worlds—human, demon, and man-beast—and dedicates centuries to this quest. Across all media, his core abilities stem from his hybrid heritage, granting significant physical strength, combat skills, and longevity, evidenced by his three-hundred-year search for the Chōjin. He maintains a close relationship with his nymphomaniac sister, Megumi Amano, who assists him, and commands loyalty from allies like Kuroko of the Kuroko tribe. In *Urotsukidōji II: Legend of the Demon Womb*, his role is secondary to the first *Overfiend* narrative. The story focuses on antagonist Münchhausen II's plot to resurrect the ancient Kyō-Ō (Evil King) using Takeaki Kiryū, Nagumo's cousin, as a vessel. Amano Jyaku appears later, reacting to these events. He participates in battles against Münchhausen II's forces and the resurrected Kyō-Ō, acting defensively to thwart the resurrection and protect his sister Megumi, who develops a tragic romantic connection with Takeaki. He demonstrates protective instincts towards Megumi during the climax atop Shinjuku skyscrapers, where she kills the corrupted Takeaki. His involvement confronts the external threats of Münchhausen II and the Kyō-Ō, serving as a stabilizing force against chaos. Within this specific sequel, his character does not undergo significant development or personal arc.