The sufferings of my past were lessons on what to do to others as revenge! If I don't cause misery equal to my own unhappiness, I'll never balance the scales! That's how it was when you're a demon! And we kill anyone who tries to tell us otherwise.”
— Gyutaro's self-righteous justification of his cruelty in How To Defeat Them
Gyutaro (妓夫ぎゅう太た郎ろう Gyūtarō?) was one of the primary antagonists in the Entertainment District Arc of Demon Slayer: Kimetsu no Yaiba. He was a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Six (上じょう弦げんの陸ろく Jōgen no Roku?), a position he shared with his younger sister, Daki.[3]
Over a century ago, Gyutaro was a human who worked as a debt collector in the Rashomon Riverbank of Yoshiwara,[4][5] the lowest class in the Entertainment District, before he and Daki were turned into demons personally by Doma, who was Upper Rank Six at the time.[6]
Tamaki Amajiki (天あま喰じき環たまき Amajiki Tamaki?), also known as Suneater (サンイーター San'ītā?), was a student in Class 3-A[4] at U.A. High School and was part of The Big 3.[5]
Following the Final War, Tamaki graduates from U.A. High School and becomes a Pro Hero[6] as well as Fat Gum's sidekick.[7]