Yahaba serves directly under Muzan Kibutsuji as a demon, distinguished by unique physical traits and specialized powers. He presents as a young man with pale, gray-tinted skin and very short black hair, typically keeping his primary red eyes closed. An additional pair of eyes resides on his palms, featuring orange irises marked with upward-pointing red arrows and dark green sclera. His attire consists of a plain olive-green kimono secured by a brown obi, a dark gray haori with green strips along the arms, white tabi socks, brown zōri, and an akoya pearl necklace. Yahaba exhibits intense loyalty to Muzan, obsessively seeking his approval and aspiring to join the Twelve Kizuki. He displays a sadistic nature but prioritizes cleanliness and order, expressing visible irritation towards dirt or disarray. This meticulousness extends to combat, where he favors precise, long-range tactics over chaotic close-quarters fighting, frequently clashing with his partner Susamaru due to her immature and messy approach. His background reveals he was deceived into believing he was a member of the Twelve Kizuki, lacking the numerical eye engraving authenticating membership. As a human, he lived with obsessive-compulsive disorder focused on cleanliness. He received Muzan's blood directly, signifying a level of trust despite not being part of the upper ranks. In the Asakusa Arc, Muzan commands Yahaba and Susamaru to hunt Tanjiro Kamado. Yahaba uses his palm eyes' enhanced tracking to locate Tanjiro and his allies despite concealment. During the assault on Tamayo's hideout, he supports Susamaru remotely by manipulating the trajectory of her temari balls via his Koketsu Arrows, initially decapitating Yushiro. After Nezuko confronts him, he engages Tanjiro directly. His Blood Demon Art generates invisible, intangible arrows that alter the vectors—directions and forces—of objects or opponents. Tanjiro eventually adapts, using the arrows' momentum to behead Yahaba. In his final moments, Yahaba laments failing to earn Muzan's approval, launching a parting attack with multiple arrows that severely injures Tanjiro before he disintegrates. Yahaba's primary ability is his Blood Demon Art: Koketsu Arrow (Red Clean Arrows), conjured through blinks of his palm eyes. These arrows manipulate vectors, enabling him to control movement, deflect attacks, or slam targets into surfaces. Their intangible and invisible nature makes them difficult to counter without enhanced perception. The palm eyes also provide advanced tracking for footprints or hidden enemies. He possesses standard demon traits like regeneration and enhanced strength, demonstrated by blocking Nezuko's kicks. A tactical fighter, he exploits environmental elements like boulders with his arrows. In the Kimetsu Academy spin-off, Yahaba appears as a third-year student and archery club president. He is the son of a tofu shop owner, maintaining his serious, orderly demeanor while assisting with school administration. Notable quotes include: "I don't think the weak have the right to breathe," and his declaration to kill targets "cruelly," expressing disdain for weakness.