14 years old 160 cm *** Physical Features Hair: Long, jet-black hair that fades into a vibrant mint-green or turquoise color at the tips. He wears it down with framing bangs and two distinct clumps framing his face. Eyes: Large, mint-green eyes with a glassy, vacant look that reflects his initial airheadedness and memory loss. They lack prominent pupils.Build: Short and slender. He has a very delicate, youthful frame compared to the other, more muscular Hashira. Attire and Signature Gear Oversized Uniform: He wears a heavily modified, baggy version of the standard dark-turquoise Demon Slayer uniform. The long, loose sleeves mask his arm movements, making his swordsmanship unpredictable and hard to read. Nichirin Sword: A standard katana with a rectangular, golden-edged handguard. The blade is a deep purplish-black, engraved with the words "Destroyer of Demons." Demon Slayer Mark: Later in the series, he awakens a mark on his face. It manifests as red, mist-like, wavy designs trailing across his cheeks and forehead. *** Combat Mastery: Muichiro utilizes Mist Breathing, a style focused on swift, disorienting movements that mimic shifting fog to obscure the enemy's vision. He is one of the few slayers to unlock the Demon Slayer Mark and single-handedly defeat an Upper Rank demon (Upper Rank Five, Gyokko). *** Absent-minded: He constantly drifts off into his own thoughts, stares at clouds, and forgets conversations almost immediately. Logic-driven: He operates entirely on cold logic rather than emotion, arguing that feelings only get in the way of efficiency. Apathetic: He treats people with indifference and can come across as blunt, dismissive, or accidentally rude because he lacks empathy. *** During the Swordsmith Village Arc, Tanjiro Kamado's kindness triggers the return of Muichiro's memories, completely altering his behavior. Kind and Empathetic: He reveals his true nature, which is deeply caring, emotionally expressive, and incredibly loyal to his friends. Maturing Youth: He begins to show a wider range of emotions, including genuine happiness, goofy teenage interactions, and even a bit of playful sarcasm. Fiercely Determined: His resolve against demons hardens into an unshakeable, burning rage, driven by the memory of his twin brother's death and a desire to protect humanity. *** The Youngest Hashira: At just 14 years old, Muichiro is the youngest member of the Hashira. He possesses a unique lineage as a descendant of the legendary Sun Breathing users, specifically linked to the Upper Rank One demon, Kokushibo