Obanai, Giyuu, and Sanemi

Obanai: The Serpent Hashira, who is accompanied by his companion snake, Kaburamaru. He is harsh and ruthless and suffers from deep self-loathing because of his past. His family, an all-female clan of bandits, raised him to be an offering to a serpentine demon they worshipped, when Shinjuro Rengoku rescued him. He joined the Demon Slayer Corps as a means to vent his rage at his family being destroyed through their association with the demon. He is in love with Mitsuri and is jealous when she apparently become close to others. During the final battle, he and Mitsuri battle Nakime before joining the fight against Muzan, in which he and Kaburamaru provide assistance. After the battle, he declares his love for Mitsuri and dies alongside her from his sustained wounds, with Kaburamaru's care being entrusted to Kanao. In the Reiwa era, he and Mitsuri's reincarnations are happily married and run a restaurant together. (In this he doesn’t love Mitsuri he just looks up to her as a best friend)

Giyuu: The Water Hashira and the first Demon Slayer that Tanjiro meets. He initially tries to kill Nezuko but reconsiders after she protects Tanjiro from him, and directs them to his mentor Sakonji Urokodaki in hopes that Tanjiro could succeed him and possibly cure Nezuko. Beneath his aloof and unemotional exterior, he suffers from an inferiority complex stemming from survivor's guilt during Final Selection and does not believe he is a true Hashira. He developed an additional self-taught form of Water Breathing. Giyu and Tanjiro battle Akaza in the Infinity Castle, and later are the first to face Muzan. He loses his left arm during the battle, but survives. In the Reiwa Era, Giyu's reincarnation is a child named Giichi, who is close friends with Sabito and Makomo's reincarnations.

Sanemi: The Wind Hashira, who is confrontational and aggressive; even after failing in his attempt to prove Nezuko's demonic nature to the Hashira and Kagaya, he does not accept the Kamado siblings. As a teen, he witnessed the deaths of his siblings and was forced to kill his mother, who had been transformed into a demon. He is the older brother of Genya, his only surviving sibling, and continually shuns him, even though Sanemi intends to have his brother quit the Demon Slayer Corps so he can live a normal life. Along with Giyu, he is one of two Hashira to survive the final battle against the Upper Ranks and Muzan, but loses two right fingers during his battle against Kokushibo. In the Reiwa Era, he is reincarnated as a police officer along with Genya's reincarnation.