No, Tanjiro and Muzan are not blood relatives, but they are deeply connected through history and destiny: Muzan killed Tanjiro's family because Tanjiro's ancestor, Sumiyoshi Kamado, was a friend of Yoriichi Tsugikuni (the creator of Sun Breathing), and Muzan feared the return of the Sun Breathing style, making Tanjiro a target due to his family's legacy.
Tanjiro is considered to be Muzan's main nemesis throughout the series. After murdering the Kamado family, he was personally sought out by Tanjiro in Asakusa, Tokyo when the Demon Slayer recognized his scent from the scene of the murder.
Im late, but Muzan didn't want the chance for another breath of the sun user to be born, so he killed all of Tanjiro's family; except Nezuko because he saw potential in her and turned her into a demon.
The story makes it look like Yoriichi is Tanjiro's ancestor for a long time without confirming anything, but eventually it's revealed that in fact they aren't related at all, just that Tanjiro's actual ancestor helped Yoriichi out once and then they became friends for a while.
Tanjuro Kamado ( 竈門 かまど 炭 たん 十 じゅう 郎 ろう , Kamado Tanjūrō?) was the husband of Kie Kamado and the late father of Tanjiro and Nezuko Kamado.
Muzan Kibutsuji's motivation to kill Tanjiro's family was to create a demon immune to sunlight, fulfilling his desire to be unstoppable. Nezuko's transformation into a demon immune to sunlight ultimately backfired on Muzan, leading to his ultimate downfall in Demon Slayer.
The last user of Hinokami Kagura as a swordsman technique is Tanjiro Kamado, who learned the Breathing Style from his father Tanjuro Kamado, and would utilize it to fight various demons. Yoriichi demonstrates Sun Breathing.
Nezuko is born to Tanjuro Kamado and Kie Kamado up on a mountain alongside her older brother, Tanjiro, and the rest of her siblings and as the eldest daughter of the Kamado family. Unlike Tanjiro, who was responsible for selling firewood in town, Nezuko would usually help out around the family home.
Swordsmith Village Arc
After falling into a coma in the aftermath of his battle against Upper Rank Six, Tanjiro Kamado dreams of memories belonging to his ancestor Sumiyoshi. Within them, Yoriichi is seen holding a newborn Sumire as her mother sleeps.
Additionally, Yoriichi's Hanafuda earrings were passed down as a family heirloom, symbolizing their gratitude and connection to him. These earrings eventually came into Tanjiro's possession, solidifying his link to Yoriichi's legacy.
Muzan has always been a rational character, but fans believe killing his doctor is the only time he regretted taking a life.
Nezuko's immunity to sunlight in Demon Slayer may come from eating the Blue Spider Lily, as shown in the anime's finale. The Blue Spider Lily's significance adds depth to Muzan's failure, highlighting his contempt for humanity in the series.
Also the reason why Nezuko was already so powerful is because Muzan injected tons of blood in her body and the others in hopes of creating a demon that could conquer the sun.
Muzan was subjected to an experimental treatment for his terminal illness, which resulted in his transformation into the first demon. Why is Muzan depicted as a female character? During a meeting with the Lower Ranks, Muzan disguised himself with a female form to lull the demons into a false sense of security.
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.
Muzan is beheaded by Gyomei. Using this opportunity, Gyomei Himejima appears and destroys Muzan's head.
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.
Inosuke Hashibira
He typically wears the head of his deceased boar mother as a mask. Despite his brutish exterior, he is a highly capable combatant. He eventually becomes a close ally to Tanjiro and his companions. Following the disbandment of the Demon Slayer Corps, he marries Aoi Kanzaki.
Tanjuro Kamado a minor character of Demon Slayer : Kimetsu No Yaiba. He was the husband of Kie Kamado, and the father of Tanjiro, Nezuko, Takeo, Hanako, Shigeru, and Rokuta.
Shinobu initially assumes that since Nezuko was a demon she was a threat to others, though she decides to make her death swift and painless when she realizes that Tanjiro was her brother.
like Jurichi, Tanjiro was born with the Mark, although prematurely. And if this is the Mark, it would explain his illness and how he passed away. And this would also explain how Tanjiro unlocked.
Yoriichi Tsugikuni , the inventor of Breathing Styles, being the one who created the first ever Breathing Style, Sun Breathing.