OVA
Description
Ryo Asuka serves as a supporting character in the crossover OVA. He presents as a young man with blond hair and blue eyes, typically dressed in a beige trench coat, light grey shirt, grey pants, and brown shoes. Acting as the close companion and strategic ally of Akira Fudo, Ryo assists in combating demonic threats. He wields firearms proficiently, notably employing an assault rifle-style weapon with a drum magazine. His skills extend to piloting modified vehicles and boats, coupled with advanced computer hacking capabilities that allow him to infiltrate the secret databases of the Black Ghost organization via the dark net.

Ryo's involvement initiates upon detecting demonic activity; he prepares to support Akira. He intervenes during Devilman's battle against the demon Pazuzu, engaging Cyborg 009 when the cyborg appears unexpectedly. Though outpaced by 009's speed, Ryo later retrieves the injured Akira after the clash between Devilman and the cyborg leaves both incapacitated. He transports Akira to safety. Learning of Black Ghost from Cyborg 003, Ryo investigates the organization. When Miki Makimura is abducted, he aids Akira in locating her by infiltrating Dr. Adams' facility, eliminating guards with his firearm and securing Miki's rescue alongside Eva Maria Parallels (Cyborg 0015).

A post-credits scene reveals a critical development: the demon Psycho Jenny visits Ryo, restoring his suppressed memories and confirming his true identity as Satan, the ancient ruler of demons, implying his human persona was a constructed disguise. In his true form, Satan possesses twelve golden wings and an intersex physiology, though this form remains unseen during the OVA’s primary events. His latent demonic powers, comparable to his manga counterpart’s abilities, are referenced but not displayed.

The character exhibits a complex duality. As Ryo Asuka, he displays loyalty to Akira and a protective stance toward humanity, willing to use lethal force against perceived threats like the cyborgs or demons. This contrasts sharply with his Satan persona, embodying a primordial desire for humanity's destruction. This internal conflict between human loyalty and demonic purpose remains unresolved by the OVA’s conclusion. Alternate media, such as the manga *Cyborg 009 VS Devilman: BREAKDOWN*, present divergent storylines where the characters originate from parallel worlds, though Ryo/Satan’s specific role in this narrative isn’t detailed within the provided materials.