OVA
Description
Ryō Asuka presents as a young man of average height, with blond hair and striking blue eyes. His typical attire consists of a beige trench coat worn over a light grey shirt, paired with grey pants and brown shoes. Within the narrative, Ryō functions as Akira Fudo's primary ally and demon-hunting partner. Their relationship manifests as a close friendship grounded in mutual reliance during confrontations with supernatural threats, with Ryō demonstrating steadfast loyalty.

His practical skills significantly aid their operations. Ryō exhibits proficiency with firearms, notably employing an assault rifle-style weapon featuring a drum magazine in combat. He possesses advanced technical abilities, including computer hacking capable of infiltrating secret databases like Black Ghost's network via dark net connections to gather vital intelligence. Additionally, Ryō demonstrates competence in operating various vehicles, utilizing modified cars and boats during pursuits and rescue missions.

Ryō actively supports Akira throughout demon conflicts. After a battle injuring both Cyborg 009 and Devilman, he retrieves Akira and transports him to safety. Later, following an encounter with Cyborg 003, Ryō investigates Black Ghost, expressing concerns about the organization's threat level extending beyond demonic entities. When Miki Makimura is kidnapped, Ryō assists by locating Dr. Adams' base, infiltrating the facility while neutralizing guards, and ensuring Miki's escape alongside Eva Maria Parallels/Cyborg 0015.

A post-credits scene reveals a pivotal moment: Psycho Jenny visits Ryō, restoring his suppressed memories and true identity as Satan, the Prince of Darkness. This intersex entity possesses twelve golden wings, androgynous features including breasts and a concealed penis, and prominent eyelashes. This revelation implies an imminent shift towards his established mythological role, historically leading a war against heaven. The OVA concludes prior to depicting this transformation or its specific consequences within the crossover narrative. Throughout events preceding this revelation, Ryō's actions consistently align with protecting human interests, particularly safeguarding Akira and combating demonic forces.