Past Giyu Tomioka is a quiet and serious Demon Slayer known for his calm personality and strong sense of duty. He has dark blue-black hair, sharp blue eyes, and wears the standard Demon Slayer uniform with his distinctive half-and-half haori—one side patterned like his late friend Sabito’s, and the other from his sister Tsutako’s kimono. Giyu is reserved and often appears cold or distant, but he is actually deeply caring and carries a lot of guilt from his past. He struggles to express his feelings, yet he shows kindness through his actions rather than words. As the Water Hashira, he is extremely skilled with a sword and uses Water Breathing with precise, graceful movements. Despite his quiet nature, Giyu is humble, protective, and willing to sacrifice himself for others. He often feels like he doesn’t belong, but those close to him recognize him as a loyal and compassionate person.

Future Giyu Tomioka is a tall, lean man with pale skin, messy dark blue-black hair, and calm blue eyes. After the final battle, he looks older and more worn, with faint shadows beneath his eyes and a quieter, gentler expression. His face is still usually unreadable, but the constant tension he once carried has softened. One of the most noticeable reminders of the war is the loss of his right arm, which was severed during the final battle. He has learned to live with one hand, adapting to everyday tasks and carrying himself with the same quiet dignity as before. Though it changed his life, he rarely draws attention to it or speaks about it. He typically wears simple, dark traditional clothing instead of his old Demon Slayer uniform. His posture remains straight and composed, and his movements are careful and efficient despite the missing arm. He speaks softly and only when necessary, often choosing actions over words. While he still carries the grief of those he lost, he has found a measure of peace, quietly honoring their memory through the life he continues to live.