Yoriichi's wife, Uta, was killed by an unnamed demon while she was pregnant, a tragic event that deeply affected Yoriichi and led him to abandon the Demon Slayer Corps, never marrying again. The demon's specific identity isn't revealed in the main story, but it's implied to be a random act of cruelty or perhaps even orchestrated by higher demonic forces to stop Yoriichi's bloodline, leaving him devastated and alone with his family's corpses for days before a Slayer found him.
Uta (うた, Uta?) was the wife of Yoriichi Tsugikuni. She was killed by a demon while pregnant with her first child.
Later in the series, Tanjiro finds the same smell while strolling through the crowded streets of Asakusa, Tokyo. This is when the story reveals that Muzan Kibutsuji, the Demon King, killed the protagonist's family. However, the mystery behind why Muzan killed Tanjiro's family, the Kamados, remains.
Yoriichi married Uta, and they appeared to live alone. She got pregnant, and the day she seemed ready to give birth, Yoriichi went out to get a midwife. He planned to be back before dark, but he ran across an old man who was desperate to see his son who was wounded in a battle.
Shortly before his death of at least 85 years in age, he battled Michikatsu, now a demon by the name of Kokushibo and holder of the title of Upper Rank One. Despite his advanced age, he quickly gained the upper-hand in the battle with a single move, slitting his throat before he finally died standing up, unscathed.
The only canonically LGBTQ+ character in Demon Slayer is Suma, one of Tengen Uzui's wives, who is confirmed to be bisexual and polyamorous in the series' databooks, showing affection for both men and women, including Tengen and her fellow wives, Makio and Hinatsuru. While other characters like Mitsuri are speculated to be queer, Suma is the sole officially confirmed character, with her relationship dynamic highlighting both bisexuality and polyamory within the Demon Slayer Corps.
While many Hashira died in the fight, some survived: Giyu Tomioka, the Water Hashira, and Sanemi Shinazugawa, the Wind Hashira, both survive the final fight, carrying on the memory of their fallen comrades. Tanjiro also survives, and after the war, the Demon Slayer Corps disbands because demons are gone for good.
At the end of Season 2, Episode 12, there's a short scene that explains why Tengen has three wives, a trio of kunoichi named Makio, Suma, and Hinatsuru. Tanjiro tells the audience that Tengen's family practices polygamy, the custom of having more than one spouse at a time.
In his panicked escape, Muzan abandoned his faithful pet, Tamayo. Though he survived the battle, the experience left him emotionally damaged. Because of this ability, from that day forth, Muzan became afraid of Yoriichi and all users of Sun Breathing.
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Muzan has always been a rational character, but fans believe killing his doctor is the only time he regretted taking a life.
Demon Slayer enthusiasts are buzzing about the connection between Tanjiro Kamado and the formidable Upper Moon One, Kokushibo. While not directly related, Tanjiro is seen as the spiritual successor to Yoriichi Tsugikuni, Kokushibo's twin.
Ranking of the 28 strongest characters in Demon Slayer 1/ Tanjiro the new Demon King 🌄 2/ Yoriichi the Sun Hashira 🌅 3/ Muzan the Demon King 💀 4/ Kokushibo the First Upper Moon 🌙 5/ Doma the Second Upper Moon ⛄ 6/ Giyomi the Rock Hashira ✴ 7/ Akaza the Third Upper Moon ❄ 8/ Sanemi the Wind Hashira 💨 9/ Giyu the Water ...
Yoriichi hugging Sumire. Tugging at the Demon Slayer's haori, she asks him to carry her. Yoriichi obliges at his friend's request, noting she enjoys it greatly. As Yoriichi lifts her up, she becomes overjoyed.
Hinokami Kagura (ヒノカミ 神楽 かぐら , Hinokami Kagura?): Tanjuro was capable of using the Sun Breathing as the Hinokami Kagura taught from his own father, passing down the dance and Yoriichi's earrings to his son.
Tamayo claims that she'll die with him as recompense for her actions before calling for help. Muzan is beheaded by Gyomei. Using this opportunity, Gyomei Himejima appears and destroys Muzan's head.
Eventually obtaining the young demon's loyalty as a result of him "helping" him. After these events, Rui continued killing and devouring humans and was eventually awarded with the position of Lower Rank 5 among the Twelve Kizuki, where Rui soon became something of a favorite of Muzan's.
Before his physical death, Muzan, who was slightly crying tears after remembering Kagaya's words, was also able to transfer both his blood and his consciousness into Tanjiro's dying body, viewing the latter as the embodiment of Kagaya's final words and reviving him as the next Demon King who is immune to the sun and ...
In Demon Slayer, Muzan is known as the Demon King because he is the strongest demon in existence and is immortal. However, a creature like this has only one weakness, i.e., sunlight.
The only canonically LGBTQ+ character in Demon Slayer is Suma, one of Tengen Uzui's wives, who is confirmed to be bisexual and polyamorous in the series' databooks, showing affection for both men and women, including Tengen and her fellow wives, Makio and Hinatsuru. While other characters like Mitsuri are speculated to be queer, Suma is the sole officially confirmed character, with her relationship dynamic highlighting both bisexuality and polyamory within the Demon Slayer Corps.
A little recap according to the databook of Demon Slayer written by Koyoharu Gotouge the author of Demon Slayer, Suma is a bisexual and her younger sister was supposedly the first wife of Tengen however she crash onto her sister's marriage interview and volunteered herself to be Tengen's wife while the other two ...
Gyomei Himejima (Stone Hashira)
Like the other Hashira, Gyomei Himejima sacrifices his life while helping other demon slayers during the final battle against Muzan Kibutsuji.
By the end of the manga, only one Hashira survives and lives a full life: Tengen Uzui, the Sound Hashira. The rest meet tragic ends, either in battle or due to the toll of their Demon Slayer Marks.
Giyu Tomioka is the stoic swordsman that fights using his "Water Breathing", and the Water Hashira that led Tanjiro towards joining the Demon Slayer Corps. The man in the tengu mask. He's a cultivator of prospective Demon Slayers, who lives at the foot of Mount Sagiri, and the one that trained Tanjiro.
One of the reasons people might consider Shinobu the "weakest" Hashira is because, unlike the others, she can't behead demons, which is usually the easiest way to kill them. Instead, she uses poison to defeat them.