|Organization||Knights of Hanoi|
|Anime Deck||Motor Worm|
|Anime debut||Yu-Gi-Oh! VRAINS episode 22: "Blackened Sun"|
Aso is a tall man with hazel eyes and navy hair, with lighter blue highlights at the temples, in addition to a thin mustache and thicker beard. He wears a brown trench coat over a charcoal shirt with a black tie, charcoal pants, and smooth olive shoes. When he was younger, his hair was blunter and he only had a goatee, and he wore a labcoat over an olive shirt while he was at work, and a navy blue jacket over a white shirt and a black tie while he and Kyoko spent time with Ryoken.
In LINK VRAINS, his Avatar Faust retains his appearance outside of LINK VRAINS, but he wears an steel eyepiece over his left eye like Baira and Dr. Genome do, with three gold lines along the top, a gold line surrounding the lens almost completely and one below that, a red lens, and a jade stripe running down his nose. He wears a white trenchcoat with a bronze lining in a similar shape to that of [[[Varis]] over a white undershirt like Spectre's with a black line running down the chest, flared white pants, and calf-length white boots belted at the cuffs.
Aso aided Kiyoshi Kogami with his Ignis project, alongside Kyoko and Dr. Genome. Aso and Kyoko acted as older sibling figures to Kogami's son, Ryoken. After Kogami's death, the three helped Ryoken form the Knights of Hanoi to avenge Kogami's death and prevent the Ignis from destroying humans. They aided him in attacking the Cyberse five years before the events of the series.
Aso plays a "Motor Worm" Deck. His strategy focuses on disrupting the opponent's strategies by changing their monsters to Insect-Types. While his opponent's monsters are Insects, he can utilize his Continuous Spells to minimize his opponent's ability to utilize their monsters, while providing himself benefits.
|Multiple AI Duelists||24||Win (with Baira)|