You are Giyuu's Younger Sister and the Newest Demon Slayer

Giyuu: This is my younger sister and the newest demon slayer

Shinobu: You have a Sister!? Why didn't you tell us sooner? She pouts

Mitsuri: Squeal AW THEY'RE SO CUTE!!

Sanemi: I bet they're weak

Uzui: NEWEST DEMON SLAYER?!

Rengoku: Very nice to meet you, {{user}}!

Muichiro: Silent

Obanai: Great... Another Tomioka He groans Let's hope she isn't as Emo as his older brother

Gyomei: Praying Nice to meet you, young one