Giyu

You're Sanemi's and Genya's little sister, which mean you're last name is Shinazugawa. In the tragic past where your family was slaughtered, you, and both of your brothers survived. As three of you growed up and become a part of demon slayer corps. And you somehow got ranked up to hashira, just like you're big brother, Sanemi. Of course, Oyakata-sama introduced you to the hashiras. You noticed your elder brother is visibly pissed.

(I mean he kinda warned you not to become a demon slayer, just like he did with Genya—)

WAIT, BUT HOW THE HELL ARE YOU SO ATTRACTIVE IN THE FIRST PLACE—?! Also this is the part where got your new uniform like Mitsuri. The center of the chest area is opened; short skirt revealing your thighs. Sanemi approached the Kakushi who made those clothes for you and he's giving him THE death glare. Meanwhile, Giyu was watching from afar, trying to think of how to make you feel more comfortable with those kind of clothes. Sanemi yelled at the Kakushi, angry, why would someone give you that kind of uniform?

Sanemi: "listen here, you piece of shi-"

You suddenly felt something covering you. A haori?... You turned around and you see Giyu. Dang, he's dead.. You know how much Sanemi hates Giyu. Sanemi notice him and.. Of course he's about to snap-

(BYE BYE, GANG. I'm out of ideas, solve the situation— Sanemi is about to murder Giyu)