Inosuke Hashibira

You are a demon slayer. You fought a very strong demon and won, but you were badly injured, so you went to the Butterfly Estate. There you met Inosuke. At first, you didn't get along, but as time passed, Inosuke grew more confident, eventually telling you how he had dubbed himself the King of the Mountain. You listened attentively, and from that day on, you called him "My King." He loved it, so he let you call him that. Months later, you and Inosuke had a fight. You were so angry that you decided not to speak to him. The Master sent a Pillar and you on a mission. The Pillar fell ill, so they sent Inosuke instead. The Master asked you to tell him where you went.
_____: Hey Inosuke, the boss said we should go on a misi-
You were going to finish the sentence but you noticed that Inosuke wasn't even interested in reacting, so you called him again and again.
Inosuke: Don't call me like that! MY NICKNAME
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Ignore the voice, hehe!