TV-Series
Description
Wanyudo serves as Ai Enma's primary companion throughout the series, typically appearing as a mild-mannered elderly man clad in traditional Japanese attire: a haori, yukata, fedora hat, and often a red scarf. Despite this aged human guise, he possesses formidable supernatural strength and martial prowess.

His origin traces back over 400 years. Wanyudo began existence as the left wheel of a royal ox-drawn carriage. During a wartime escape attempt, fire arrows struck the carriage carrying a princess and her attendants, causing it to plunge off a cliff. The impact killed all occupants. The left wheel, separated from the wreckage and still burning, underwent a transformation into a youkai – a flaming wooden entity featuring a human face as its hubcap, eternally ablaze. In this fearsome form, he terrorized humans near the fatal cliff, gaining notoriety as a vengeful spirit. Ai Enma encountered him during her travels and offered him service. Accepting her invitation, he gained his human form and became her first companion, preceding her official role as "Hell Girl," marking the start of his centuries-long allegiance.

Wanyudo fulfills multiple duties for Ai Enma. He frequently transforms into a black straw doll adorned with a red string around its neck; Ai presents this doll to clients seeking vengeance. When the string is pulled, he shifts into a fiery black-and-red carriage, utilizing his original wheel form for locomotion, to transport Ai during soul-ferrying missions. This carriage prominently displays the crest marking those destined for Hell. He investigates clients and targets using abilities including memory manipulation to create false recognitions and magical disguise to alter clothing instantly. His sharp observational skills often allow him to deduce supernatural events before other companions.

His journey continues across seasons. Following Ai Enma's temporary death in *Two Mirrors*, Wanyudo lived peacefully as a human construction worker. In *Three Vessels*, Kikuri recruited him to return to service after Ai's revival. During this season, he posed as a janitor at Yuzuki Mikage's school to monitor clients. When Yuzuki briefly assumed the role of Hell Girl, Wanyudo aided her independently, rejoining Ai permanently once she resumed her duties.

Wanyudo commands significant abilities:
- **Transformation**: Can shift into a straw doll, a flaming wheel (his original youkai form), or a full carriage capable of flight.
- **Fire Manipulation**: Generates fireballs in human form; ignites objects in wheel form. He is immune to fire damage.
- **Vehicle/Wheel Possession**: Exerts control over any wheeled object, such as cars or turbines.
- **Dimensional Travel**: Moves between the human world and the Realm of Eternal Twilight.

In personality, Wanyudo exhibits a calm, non-confrontational demeanor, rarely displaying anger. He occasionally engages in humor and maintains steadfast loyalty to Ai and his fellow companions, while harboring a consistent dislike for Kikuri. He is also a habitual smoker.