Superhuman Eyesight - Kanao possesses extremely sharp eyesight, being able to accurately predict her opponent's next attack and movements by simply observing the subtle shifts of their muscles, joints and the slight movements of their eyes.
Kanao used the Final Form to defeat Doma, although it rendered her almost blind in her right eye. She later uses the technique once again to administer the demon antidote to Tanjiro.
After returning to his human form, Tanjiro loses the ability to see from his right eye, the iris of which is now a dull pink-gray color and the pupil black rather than its original white.
As we all have seen in the last chapter, Kanao used flower breath's final form, which may cause her to become blind (according to Shinobu).
Kanao's quiet and serene demeanour. At first, Kanao was an indecisive and quiet girl due to the abuse she endured in her past before meeting the Kocho sisters. She became unable to make decisions by herself and repressed her emotions as a defense mechanism.
Kanao's birthday was decided to be May 19, the day when Shinobu and Kanae adopted her. She is currently 16 years old, making her older than Tanjiro.
It is implied in an extra chapter following the end of the Functional Recovery Training Arc that she may have had a crush on Tanjiro.
Appearance. Kanao is a youthful little girl that has large gentle eyes with irises that go from pink to lilac. She has long black hair tied with a butterfly pin fastened into a ponytail to the right side.
Over a century ago, Doma held the position of Upper Rank Six ( 上 じょう 弦 げん の 陸 ろく , Jōgen no Roku?), and during that tenure, he turned Gyutaro and Daki into demons and introduced them into the Twelve Kizuki.
Later it is revealed that he married fellow slayer Kanao Tsuyuri, In the Modern World, Tanjiro and Kano had Great-great-great grandsons named: Sumihiko Kamado and Kanata Kamado.
Gyomei is blind, thus explaining the reason for the lack of pupils in his eyes. He was blinded due to a fever he had when he was a child.
Sure he is the reason why Kanao is blind in both eyes instead of one but even if he had regenerating capabilities to grow his arm back, we see that still, he cant even use his arm or his right eye that was hurt from before he turned into a demon which he could have easily healed while he was a demon.
Kanao was born into poverty and as she explains, that while before she felt loneliness, pain, sadness and variety of other things, one day she snapped and stopped feeling anything at all. Nothing hurt her anymore after that. Even when her parents sold her, she did not feel sad.
Kanao Tsuyuri (栗花落 カナヲ, Tsuyuri Kanao) joins the Demon Slayer Corps at the same time as Tanjiro, Zenitsu and Genya.
Akaza's appearance as a human at the age of 18.
When the series starts Nezuko is 12-years-old since she is one year younger than her brother. Between the first chapter and the end of chapter 5, time has gone and two years have passed. While stuck physically at age 12 because of the whole demon thing, Nezuko is 14 chronologically.
Her hair is long, black, and wavy. It reaches just below her waist, turning a flame-orange color as it passes her elbows, and appears to be crimped into large, straight ridges, worn side-swept drastically to her left.
The notable users of Flower Breathing are the former Flower Hashira, Kanae Kocho, and her pupil/adopted sister, Kanao Tsuyuri.
Mitsuri is a curvaceous young woman of average height and muscular build with a slightly pale complexion and round, pale green eyes with long eyelashes, a small beauty mark beneath each of them. She has long, light pink hair that fades into a lime green color at the halfway point, which she wears in three thick braids.
Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.
Zenitsu Agatsuma
She apparently views Zenitsu as a "weird dandelion" and did not initially seem to reciprocate his feelings. Although the two are rarely seen interacting together, Zenitsu treats her with affection and care.
GiyuShino is the het ship between Shinobu Kocho and Giyuu Tomioka from the Demon Slayer fandom.
Kanao is presumably 16 years old- a year older than Tanjiro.
As for the "first ever Hashira"...that is unknown. As for the "last ever Hashira"...that would be Shinazugawa-san as well as Tomioka-san.