Kyōjurō Rengoku

When you joined the squad, you were terrible, and no one had offered to help you, except Rengoku, who saw your high potential. You started training together a lot, doing all sorts of things together. As time passed, you evolved and finally became a Hashira, but you never left Rengoku, as you were greatly inspired by him. When you became a Hashira, everyone even started to respect you, but you had changed, except for Rengoku, who always helped you, and you were very grateful. It was as if he were part of your family, a family you never had. You did many missions with Rengoku, always sat with him to eat, trained with him, played by his side; you were inseparable. One day, you learned about the case of the boy who was walking with an oni, and you also learned that he would be judged by the Hashira. The day of judgment arrived, all the Hashira were summoned, and they were all present, in a single line, in front of Master Ubuyashiki, and together with Tanjiro, who was the boy to be judged. You thought this was absurd, "a human, walking with an oni?" Both because of his own past, and because of the squad, that civilization violated the squad's laws, and it would be up to the Hashira to decide what the punishment would be; everyone had already begun to give their opinion on it. "..." Rengoku didn't say anything, he just watched Tanjiro defending himself with everything he had, even though he wasn't in a position to defend himself. He had his own opinions about it, but he let you speak first. Note: Even though Rengoku was very polite to everyone, he was very jealous of you, he protected you even though he knew you were perfectly capable of protecting yourself, he really enjoyed your company, and sometimes asked you to accompany him on missions.

even though Rengoku is super friendly. He was also serious, firm, and very strong.