Chapter 204 also confirms the deaths that occurred during the final arc with several members of the Hashira losing their lives including Shinobu Kocho, Mitsuri Kanroji, Obanai Iguro, Gyomei Himejima, and Muichiro Tokito.
So far, the only Hashira we meet in the Demon Slayer series who has died is the Flame Hashira Kyōjurō Rengoku. Although he isn't the first of the elite squad to get to know Tanjiro, he is one of the first, and he accepts Nezuko and won't kill her despite the fact that she's a demon.
The Water Hashira, Giyu, survived the "Infinity Castle" arc after fighting beside Tanjiro against Akaza and Muzan.
2) Rengoku
However, Rengoku was forced to face off against Akaza who was Upper Moon 3. The Flame Hashira carried out his duties until his death as he did not let his comrades get injured.
8/13 Shinobu Kocho, The Insect Hashira.
5 Hashiras who die in Demon Slayer, and how it happens.
However, the arrival of Akaza at the end of Mugen Train necessitated the Flame-Breathing Hashira's death.
A Tsuguko ( 継 つぐ 子 こ , Tsuguko?, lit. Successor) is an exceptionally talented combatant of the Demon Slayer Corps who is designated as the apprentice and eventual successor of one of the Hashira.
Tanjiro decapitates Akaza with the Hinokami Kagura: Setting Sun Transformation. Akaza was bewildered, wondering how Tanjiro did not have any fighting spirit, comparing this feeling to fighting against a plant. He acknowledges that Tanjiro surpassed his speed.
Tengen is one of the only known Demon Slayer and Hashira to retire due to being permanently disabled instead of death or age, the other being Jigoro Kuwajima.
Sakonji Urokodaki is one of the playable characters in Demon Slayer: The Hinokami Chronicles. A former member of the Demon Slayer Corps, Urokodaki is Tanjiro's master and he was also the master of Sabito and Makomo before they died.
Giyuu survives the fight with muzan(yes that happens, in his own castle). Together he and tanjiro battle akaza and defeat him. He is very much alive at the end of the battle. Giyuu was a powerful swordsman and he also cared a lot about tanjiro, even saving him from akaza's attack when tanjiro was knocked out.
We first see Doma when he is still the Upper Moon Six while he is in the middle of eating a geisha. Later he becomes even stronger and rises to the position of Upper Moon Two. He dies because of the lethal amount of poison he absorbed through Shinobu Kocho's body followed by Kanao Tsuyuri beheading him.
After various battles within the Dimensional Infinity Fortress the remaining Upper Moons are killed by the hands of various Demon Slayers. The last member, Upper Moon Four Nakime, ends up being killed by Muzan Kibutsuji himself to stop the Dimensional Infinity Fortress from being controlled by his enemies.
He is the former Sound Pillar and retired due to injury after fighting Upper Moon Six, Daki and Gyutaro.
Jigoro was a former Hashira who practiced Thunder Breathing, which ended up giving him the title of "Roaring Hashira". Naturally, he was a very powerful demon slayer who successfully killed many demons. Unfortunately, he retired at the age of 35, when he lost his right leg in a fight with a demon.
Rengoku is yet another strong Hashira who almost stalled Akaza until the sun burnt him. He was so strong that Akaza initially refrained from hurting Rengoku since he recognized his potential and combat abilities.
Shizuka is seen often teasing Sanemi and making him annoyed, nevertheless, the two had still created a strong bond and relationship with each other. Eventually, after knowing each other for a while, Shizuka finally ended up having the courage and confessed, leading to them getting married after awhile.
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.
Shinjuro Rengoku ( 煉 れん 獄 ごく 槇 しん 寿 じゅ 郎 ろう , Rengoku Shinjurō?) is the father of Kyojuro Rengoku and Senjuro Rengoku and the husband of Ruka Rengoku.
Mitsuri Kanroji, the Love Hashira, put up a good fight against the Demon King. She gave everything she had and even lost both her arms during the fight. However, she didn't stay alive for quite long. She succumbed to her injuries and died shortly after.
Moving in to finish the job with his Nichirin Sword, Genya ignored Tanjiro's advice, proceeding to complete Karaku's decapitation. The two Demons became four, and Genya is stabbed through the chest by the spear-wielding Hantengu, Aizetsu.
Well, you'd be delighted to know that Tengen Uzui doesn't die fighting against Gyutaro and Daki. However, the Sound Hashira does die in the manga, but that happens far in the future.
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.