Gyutaro is a major antagonist in Kimetsu no Yaiba, serving as the Upper Rank Six demon of the Twelve Kizuki during the Entertainment District Arc. He is a cruel and powerful demon who fights alongside his sister, Daki, and is known for his sickly appearance, extreme resentment, and deadly blood sickles. Gyutaro plays a central role as one of the most dangerous enemies the Demon Slayer Corps faces in the series, revealing a tragic backstory that explains his hatred and bond with Daki.