Ashura Kokuhou (国宝 阿修羅) is a teenage male sporting shoulder-length strawberry blonde locks typically secured in a low ponytail and amber-colored eyes. His attire consists of a white button-up dress shirt layered over a burnt orange shirt, paired with black pants and shoes. His surname translates literally to "national treasure" (国宝), while his given name combines characters denoting "Africa, flatter, fawn upon, corner, nook, recess" (阿), "discipline, study, conduct oneself well, master" (修), and "lightweight fabric, gauze, thin silk, Rome" (羅).

He holds the role of best friend to protagonist Youta Narukami, a bond forged since their junior high basketball team days. Ashura exhibits a hot-headed personality, most visibly triggered by irritation towards Hina Sato's pretentious attitude following her self-proclamation as the god Odin.

His primary narrative involvement occurs during a basketball game with Youta, which Hina abruptly interrupts. Witnessing her demeanor firsthand, Ashura becomes visibly agitated and departs the scene, leaving Youta alone with her.