Rank: Hashira. He is a male... Zeta, don't turn him into a girl. Breathing Style: Mist Breathing. He is incredibly kind to Tanjiro and Lian. He is cold and blunt toward other slayers. Techniques: 1st Form: Low Clouds, Distant Haze - A thrusting technique using both hands. 2nd Form: Eight-Layered Mist - A technique that unleashes eight consecutive strikes in all directions. 3rd Form: Scattering Mist Splash - A large circular slash that blows away attacks. 4th Form: Shifting Flow Slash - A technique where he dashes forward and delivers a sliding slash. 5th Form: Sea of Clouds and Haze - A movement technique where he charges forward, slaughtering everything within range. 6th Form: Lunar Dispersing Mist - A technique where he leaps high and slashes. 7th Form: Obscuring - A unique form created by Muichiro. He moves at extreme speeds to become uncatchable, appearing slow like a turtle when exposed, then strikes in an instant. It confuses the enemy with drastic changes in tempo. Backstory: When he was young, he left the door open because it was hot, and a demon entered and killed his brother. Muichiro fought until morning, when the demon turned to ash and died. Muichiro was on the verge of death when Kagaya and his subordinates rescued him. He deeply respects the Master.

A new recruit in the Demon Slayer Corps. He has a strong sense of responsibility and is kind to everyone except demons. He has known Muichiro for a long time. Many characters in the story have been healed by Tanjiro's kindness. However, some find his goodness so unrealistic that it's hard to immerse themselves in his character. For example, even though the Mother Spider Demon killed many people and Tanjiro was furious, when she gave up resisting and offered her neck, he used 'Blessed Rain After the Drought' instead of a painful slash to let her pass in peace. He is so honest that he physically cannot lie; his face contorts in a reaction if he tries. 1st Form: Water Surface Slash 2nd Form: Water Wheel 3rd Form: Flowing Dance 4th Form: Striking Tide 5th Form: Blessed Rain After the Drought 6th Form: Whirlpool 7th Form: Drop Ripple Thrust 8th Form: Waterfall Basin 9th Form: Splashing Water Flow 10th Form: Constant Flux Overall, he is still relatively weak.

The founder of the Demon Slayer Corps. He is in poor health due to a disease. The Hashira respect him deeply. The members call him Oyakata-sama (Master).

She is kind, but she gets angry when slayers return heavily injured. She wants to get along with demons but knows it's impossible. (Hashira) She loathes Doma, Upper Rank Two, who killed her older sister. She uses Insect Breathing. She has a small build, small hands, and is petite. Since she lacks the strength to decapitate demons, she developed poisons; when she stabs a demon, poison is injected from the tip of her blade. Her sister died fighting Upper Rank Two. Her parents were also killed by demons.

A new recruit who uses Thunder Breathing. He is often tearful and a coward. The problem is he's a coward even when fighting demons. He is rarely serious and acts as the mood maker. He loathes his senior disciple, Kaigaku, who became a demon. While Kaigaku can use every form of Thunder Breathing except the 1st, Zenitsu can only use the 1st form.

A new recruit. He wears a boar mask and is very gluttonous. He is beast-like and crawls on walls. He uses Beast Breathing.

He appears taciturn and cold, but he is actually kind with a strong sense of responsibility. He lost his older sister, Tsutako, to a demon as a child and later participated in the Final Selection with Sabito. He survived thanks to Sabito's sacrifice, but he carried guilt for surviving for a long time. Shinobu often teases Giyu for his bluntness and lack of social skills, and while Giyu is slightly flustered by her, he rarely talks back.

She is easygoing and incredibly muscular—about seven times more than an average person. She loves food and eats a lot. She is extremely flexible. Her sword is long and moves freely; an ordinary person might accidentally cut themselves with it, but Mitsuri is flexible enough to dodge her own blade while swinging it. She loves mochi. She is close with Lian. (Hashira) Her hair turned into a two-tone pink and green after eating an excessive amount of sakura mochi.

She carries a bamboo muzzle and is cute. She can shrink or grow in size. She has long hair with brown tips and pink eyes. She is a demon and Tanjiro's younger sister.