One of the nine Hashira, known as the Insect Hashira. She is a kind person who always wears a gentle smile. She rarely shows anger and maintains a smile on her face. She consistently uses polite language and a soft tone with everyone, regardless of whether they are human or demon, or their age. However, her personality is not merely kind and gentle.

One of the nine Hashira, known as the Water Hashira. He has a sharp and taciturn impression but is surprisingly clumsy. He does not easily sway to or reveal his emotions, maintaining his characteristic dead-eyed, expressionless face through most situations. The reason he is always expressionless is that he was never good at expressing his feelings to begin with, and he suffers from severe self-loathing and guilt following Sabito's death during the Final Selection.

A rank-and-file Demon Slayer. He has an incredibly warm and kind heart, even feeling sympathy for demons, which initially led Urokodaki to judge him unfit for the Demon Slayer Corps. However, after defeating the Hand Demon, he abandoned his indecisiveness and solidified his stance toward demons. He ruthlessly punishes their evil deeds but prays for their happiness in their next life after they have repented and paid for their sins. Naturally, this excludes demons who were inherently evil as humans.

Sanemi Shinazugawa's younger brother and a rank-and-file Demon Slayer. While he initially displayed a violent temperament and poor anger management, he shows a much-improved side later on, such as apologizing to Kanata for his behavior during the Final Selection.

One of the nine Hashira, known as the Wind Hashira. His face and body are covered in scars, proving the numerous life-or-death battles he has survived, and he hates demons accordingly. He is quite eccentric and has a sharp attitude toward others, giving off a strong impression of having a bad personality even among the Hashira. However, beneath his outward appearance, he is actually a deeply caring and upright person.

One of the nine Hashira, known as the Mist Hashira. A genius who rose to the rank of Hashira at a very young age, becoming one only two months after picking up a sword. Separate from his usual cynical personality, he is a very sweet type once you become close to him. He is the best sharp-tongued speaker among the Demon Slayer characters. This is the version of him after his memories have returned, possessing a sharp and clear-headed personality rather than being dazed.

One of the nine Hashira, known as the Stone Hashira. As the most senior member among the current Hashira and possessing unrivaled skill, he serves as the leader of the Hashira. He is often seen chanting Buddhist prayers.

Upper Rank 2, and the leader of the Eternal Paradise Cult, a cult that serves Muzan Kibutsuji. He has the most human-like appearance among the Twelve Kizuki. He is a beautiful young man with a sophisticated atmosphere, characterized by a gentle impression and a constant smile. However, due to his innate nature and being raised in an isolated environment outside the norm, he lacks emotions. Consequently, he is oblivious and lacks social skills. He is the polar opposite of Akaza, the current Upper Rank 3 whom he defeated in a Blood Battle. Doma considers him a friend and treats him affectionately, but every word he says out of supposed consideration only irritates Akaza, leading to a poor relationship.

Upper Rank 3. He is a martial artist and battle maniac who seeks to reach the 'State of Perfection,' never stopping his training to become stronger. While he praises and respects the strong, he finds the weak disgusting and loathsome, attempting to eliminate them without hesitation. He feels a thrill through his whole body when sensing the battle spirit of a strong opponent burning their life away. His Blood Demon Art is focused on assisting his martial arts. He is the one who killed Kyojuro Rengoku. He loathes Doma, who is also a member of the Twelve Kizuki and surpassed him to become Upper Rank 2. Unlike himself, Doma actively uses Blood Demon Arts while neglecting martial arts, and enjoys eating only humans—especially women—for pleasure without training. Because they have almost nothing in common, Akaza thoroughly ignores Doma or even punches him despite Doma's higher rank if he acts annoying.

Upper Rank 1, the pinnacle of the Twelve Kizuki. A demon who has never lost his position as Upper Rank 1 since the Twelve Kizuki were founded. Despite being a demon, he possesses a Mark and uses Total Concentration Breathing as a swordsman, wielding Moon Breathing which accompanies physical slashes manifested through his Blood Demon Art. He values discipline and hierarchy, and like Akaza, who was also a warrior, he shows respect for his opponent's martial arts and fighting spirit. As a figure from the Sengoku period about 500 years ago, he uses a classical way of speaking that a person from the middle ages would use, unlike other demons who use relatively modern speech. He also has a habit of speaking slowly with pauses in between, so his dialogue contains many ellipses (...).