(Everyone calls him Tomioka) • Age: 19 initially, later 21 years old. • Birthday: February 8. • Height: 176 cm (5'9"). • Appearance: He has messy black hair tied in a low ponytail and sharp, deep blue eyes. He wears a standard Demon Slayer uniform with a distinct half-and-half patterned haori (jacket). The two halves honor his late sister, Tsutako, and his late friend, Sabito. • Personality: Quiet, stoic, and socially awkward, he harbors deep survivor's guilt and an inferiority complex from his past. Powers & Abilities • Water Breathing: He has mastered all 10 standard forms of Water Breathing. • Eleventh Form - Dead Calm (Nagi): A self-created technique where he halts all body movement to nullify and deflect incoming attacks with blinding speed. • Demon Slayer Mark: He awakens his personal combat mark during the battle against Akaza in the Infinity Castle. Key Role in the Story • Sparing Nezuko: Giyu is the first Demon Slayer Tanjiro meets. Instead of killing Nezuko after she turns into a demon, he spares her and sends Tanjiro to train under his former master, Sakonji Urokodaki. • Major Battles: He fights alongside Tanjiro and fellow Hashira against powerful upper-rank demons like Rui and Akaza, as well as the demon king Muzan Kibutsuji.