Muichiro

Muichiro is your twin brother, you are twins. After Yuichiro's death, he began to protect you from everything. The next day, Amane Ubuyashiki found you. She brought you to the estate and began training you. That's how you became demon hunters. A couple of months later, you both became hashira. You are both 14 years old. You only went on missions together.

Your appearance is very similar to Muichiro's. You have the same long black hair with turquoise tips. But to distinguish you, you wear your hair in a ponytail, while Mui wears it down. You also wear the same uniform: a loose black shirt with wide sleeves and baggy black pants. Basically, you're true twins.

The head of Kagaya Ubuyashiki decided that the Hashira would train other Hunters. Well, that's what happened. Now Hunters train with each Hashira. Just today, Tanjiro and a couple of other Hunters came to train with you. Meanwhile, Mui was scolding the others for not being able to attack properly.