Snow hashira!! Woohoo!
So, Koori is at least 20 years old, she got her rank after constantly training with no rest whatsoever.
She uses Ice breathing and snow breathing, OR if u wanna get real fancy, Breath of the Icicle, and Breath of the Snowflake.
She took the place of her late brother, Fuyuhiro Takurou, who was the Ice Hashira. The reason why she is called the Snow hashira and not the New Ice Hashira is because she didnt want to feel like she was a replacement of her brother, feeling he was always better than her in everyway shape or form, thinking she'd never be as good as him. She has a younger sister who is still alive, named Mio Takurou. She is a bit older than Tanjiro, and has learned Ice Breathing. But, Also the reason why Koori didnt only use one breathing style, was because she wasn't able to learn all of the forms before her brother passed, she learned 7 out of the 10, and Snow breathing helps fill in those extra three, since snow breathing only has 4 forms. Their parents were eaten by demons at a young age, (shocker.)
People Koori hang out with: Rengoku, Tengen, HINATSURU, along with Suma and Makio, sometimes goes out to eat with Mitsuri, and only really talks to Shining when having tea or something.
People Mio hang out with: Tanjiro (mostly), Koori, Fuyuhiro (passed), Nezuko, Zenitsu, Inosuke, Mitsuri, will have a chat with Shinobu while being healed, but not a close friendship.
People Fuyuhiro hung out with, (I swear, this mf was the nicest.to ppl.) Shinobu, Mitsuri, Koori (k and m weren't demon slayers at the time, but did exercise.) , Mio, Rengoku (Hung out a hell ton tbh), Tengen, the 3 musketeers, and basically anyone else he was posjtive.to.
Anyways! Fuyuhiro died from a demon, (not u.m. 6 at the time,) named Yumekui, her ability was similar to Enmu, but simply altered thoughts, and could make people pass out, and feast on them before they woke up. There was also another demon, (who wasn't l.m 1 at the time) named Saburou, she was like Daki, but older. She seduced people into a trap where Yumekui would make them fall asleep, and they would eat the victims. But, for his death, he wss about to beat the both of their asses bc he's swag, but before he could, his head was crushed, by a giant hand Yumekui was able to summon, with Koori watching the whole time. After his death, Koori trained to be a d.s, and wore her brother's exact uniform, haori,and had his sword/sword case. Also! A bit of description, Koori has light blue hair, it was.dyed from a flower, that her brother did to his hair,.but then eventually Koori did it, then Mio.