Matakara Asamine is a fair-skinned, muscular young man sporting short brown hair parted on the left, aquamarine eyes, and a characteristically gentle smile. His typical attire consists of a sky blue V-neck long-sleeve shirt featuring dark blue collar detailing, black pants, white sneakers with sky blue soles, and an open black gakuran jacket that displays Minato Kai armbands on each bicep. Naturally a pacifist, Matakara avoids conflict and maintains a calm, kind demeanor. This disposition shatters after his older brother Mitsukuni—who raised him following their parents' abandonment—is stabbed in juvenile detention. The trauma triggers severe emotional distress, manifesting as hallucinations and profound withdrawal. His psychological state deteriorates further when he becomes the vessel for the supernatural entity Ichiya. Ichiya pressures Matakara to become a "honki warrior," manipulating him by exploiting his trauma. The entity convinces him his kindness is weakness and that his childhood friend, Arajin Tomoshibi, is responsible for his perceived failings. This manipulation drives Matakara to aggressively pursue Arajin, though internal conflict eventually causes him to abandon this pursuit. Under Ichiya's intensifying influence, Matakara adopts a colder, more violent personality. He attacks members of rival gangs like the NG Boys and Siguma's squad over minor provocations, believing any restraint signifies weakness. During a critical confrontation with Marito, he resolves to resist Ichiya's consumption, unlocking significant strength and achieving victory. This triumph cements his transformation into a detached, combative figure, leading him into frequent violent confrontations. Matakara resides in a bathhouse and employs a hybrid fighting style combining Boxing, Muay Thai, and Taekwondo. His relationships include a complex bond with Arajin, whom he initially idolized but later targeted due to Ichiya's influence, and a deep-seated loyalty to his brother Mitsukuni, whose trauma fundamentally altered Matakara's path.