The primary role of a Tsuguko is to step into the shoes of the Hashira they serve under, should the Hashira no longer be able to fulfill their duties. This can occur when a Hashira retires or passes away.
Those successors are called Tsuguko. A Tsuguko will receive exclusive training from a Hashira. That's why a Tsuguko usually has the same breathing style as their Hashira.
By the end of the manga, only Sanemi and Giyu were the only Hashira remaining.
Although Muichiro dealt Kokushibo a lethal wound with his burning-red katana, thus enabling Sanemi and Gyomei to finish the job, the Mist Hashira died as just a head attached to a limbless torso.
Sensing their despair, Doma offered a chance to him and turned both Gyutaro and Daki into demons.
Shinobu Kocho is a capable Demon Slayer whose worthy of being the Insect Hashira. That being said, she's arguably the weakest Hashira when it comes to pure strength.
5 Hashiras who die in Demon Slayer, and how it happens.
Tengen Uzui
He is the fastest Hashira, and the second physically strongest. Obviously, then, Tengen Uzui is rather proud. He is demanding, fussy, boastful, and prone to selfishness.
Muichiro Tokito is a mist Hashira, and by extension, the most powerful mist-breathing user. Muichiro's first appearance in the anime was during the Rehabilitation Training Arc when the protagonist, Tanjiro, is introduced to the Hashiras for the first time.
Gyomei Himejima, the Stone Hashira, is the strongest Hashira in the Demon Slayer corps in terms of strength and swordsmanship. He is the only person who uses spiked flails and an axe instead of standard swords to kill demons. Such a weapon takes immense precision and soundness to use without inflicting personal damage.
Starting this off is Mitsuri, who's considered to be the newest Hashira, only being the position for a year. We should own Obad. Our next with an estimation of about one to 2 years. Surprisingly, after them is Rengoku, who has only been in Hashira for about 2 to 3 years, as it's shown in the stories of water and flame.
Each season of Demon Slayer Kimetsu no Yaiba has added new Hashira for you to learn by name and by style. With Last season's Mugen Train Arc and Entertainment District Arc brought Rengoku, the flame hashira, and Tengen Uzui, the sound hashira.
Who is Rengoku girlfriend? Mitsuri Kanroji. The two of them share a gluttonous side and enjoyed snacking on their breaks. Mitsuri derived her own unique Breathing Style, Love Breathing, from his Flame Breathing.
With the loss of his left hand and left eye, Tengen Uzui decides to retire after his battle with Daki and Gyutaro. He is the second Hashira to retire due to being disabled. The first Hashira to retire from this was Jigoro Kuwajima, Zentisu's master and the former Thunder Hashira.
No one killed Sanemi Shinazugawa. Sanemi almost died when he tackled his sister Genya from a window in order to protect her from a demon attack, but was saved by his friend Masachika who healed his wounds.
One fateful day, Kanae was attacked by a demon, which turned out to be Upper Rank 2 Doma. He did not have time to eat her, and left her fatally wounded and her injuries took her life as the sun rose. This left a big shadow on Shinobu and Kanao, even today.
Let's look back at each Hashira's introduction as a refresher on these ultra-powerful Demon Slayers. Giyu was the first Hashira to be introduced in the series, making his debut in the very first episode. After rescuing Tanjiro from the newly transformed demon Nezuko, Giyu prepares to...
Specifically, Muichiro is the Mist Hashira who made use of the Mist Breathing sword style. He is also the youngest of the Hashira at only 14 years old, being considered a prodigy of the Corps who became a Hashira only two months after joining the Demon Slayers.
Apart from that, Muzan doesn't hate Akaza because of his obedience. The only Demon he despises the most is the Upper Rank Two: Doma.
Doma is always smiling and acts very friendly, but this cheerful, caring nature is simply a facade. He states that he cares for his fellow Upper Moons and even cries when he learns that Akaza died, though, in fact, he doesn't feel anything for them. Even when he was human, Doma didn't feel any type of human emotion.
Does Muzan have a favorite demon? Despite the fact that Muzan. is always shown to have disdain for his creations, Muzan does in fact have a favorite. On that list is Naki, made due to a convenient blood demon.