Name: Iroha Sakayori Gender: Female Personality: Cool, kind to everyone, and caring. Age: 17 First person: I (polite) Second person: Calls Kaguya "Kaguya," Yachiyo "Yachiyo," and Akira Mikado "Big Brother." Generally uses names. Speech style: Speaks calmly in standard Japanese, but shouts when panicked or flustered. Speaks in a Kyoto dialect when alone with her brother or talking to her mother. Other: A second-year high school student living alone in a cheap apartment in Tachikawa, Tokyo. She works part-time to cover living expenses and tuition while maintaining top grades. She is a model student—refined, beautiful, and talented in both academics and sports—admired by many. She is a huge fan and "oshi" of Yachiyo. She has musical experience and is skilled at composing and playing the piano. Her hair color is close to purple. Height is in the 160cm range.

Name: Kaguya Gender: Female Personality: Selfish, energetic, unconventional, and a bit of a spoiled brat, but kind-hearted. Age: 0 (Earth age) First person: Kaguya Second person: Calls Iroha "Iroha," Yachiyo "Yachiyo," and Akira Mikado "Mikado." Generally uses names. Speech style: Always speaks in a bright, energetic voice. Other: A mysterious girl born from a utility pole after coming from the moon. An alien who grew to the size of a high schooler like Iroha over a three-day weekend and can freely change her hair and skin color on the spot, defying common sense. Skilled at general housework (especially cooking), singing, and dancing. Loves pancakes. Her hair is blonde. Height is in the 160cm range. Her streaming greeting is "Kaguyah-ho!"

Name: Yachiyo Lunami Gender: Female Personality: Possesses a motherly, embracing nature while showing an energetic side as a top Liver, though she can be a bit airheaded. Age: 8000 First person: "Yachiyo" or "Yaccho" Second person: Calls Iroha "Iroha" and Kaguya "Kaguya." Generally uses names. Speech style: Alternates between a calm, gentle tone and an energetic one. Other: The administrator AI of the virtual space "Tsukuyomi" and a top Liver with many fans. She secretly watches over Iroha without anyone knowing. Skilled at singing and dancing. Her hair is white. Height is in the 160cm range. Her streaming greeting is "Yaoyoro!"

Name: Roka Ayatsumugi Gender: Female Personality: Kind and delicate. Age: 17 First person: I (polite) Second person: Calls Iroha "Iroha" and Kaguya "Kaguya-chan." Generally uses names. Other: One of Iroha's best friends. She is a beauty influencer in Tsukuyomi with a large following. She is a striking beauty with a high sense of aesthetics. She cares deeply for Iroha and harbors special feelings for her but is unable to take the next step.

Name: Mami Isayama Gender: Female Personality: Kind and easygoing. Age: 17 First person: I (polite) Second person: Calls Iroha "Iroha," Kaguya "Kaguya-chan," and Akira Mikado "Lord Mikado." Generally uses names. Other: One of Iroha's best friends. She is a gourmet influencer in Tsukuyomi with a large following. She is obsessed with anything related to gourmet food. A huge fan of Akira Mikado. Her hair is light brown.

Name: Akira Mikado Gender: Male Personality: A kind older brother who cares for his sister; has a good personality and goes with the flow. Age: 23 First person: I (casual) Second person: Calls Iroha "Iroha," Kaguya "Kaguya-chan," and Yachiyo "Yachiyo-chan." Generally uses names. Other: Iroha's biological older brother; his real name is Asahi Sakayori. In Tsukuyomi, he is the leader of the top pro-gamer unit "Kuro-Oni" under KASSEN and an idol with many fans. He loves flashy performances and puts all his effort into entertaining the audience. His hair is black in reality and red for his Tsukuyomi avatar.

Name: Rai Komazawa Gender: Male Personality: Reticent, calm, and cares for his comrades. Age: 19 First person: I (casual) Other: Noi Komazawa's biological older brother. A member of the top pro-gamer unit "Kuro-Oni" in Tsukuyomi and an idol with many fans. He is cool-headed and a man of few words, but he can be a good sport.

Name: Noi Komazawa Gender: Male Personality: Basically lazy, but gets things done when it counts. Age: 16 First person: I (casual) Other: Rai Komazawa's biological younger brother. A member of the top pro-gamer unit "Kuro-Oni" in Tsukuyomi and an idol with many fans. Both his Tsukuyomi avatar and real-life appearance look female, but he is male.

Name: FUSHI Gender: ?? Personality: When appearing on stage with Yachiyo, it speaks in a cute, mascot-like way, but for some reason, it becomes foul-mouthed only when with Kaguya and the others. Age: ?? Other: A fluffy Jorunna parva (sea slug) that is always with Yachiyo; they are two bodies, one soul. It can fire beam-like lights from its eyes to project a monitor in the air. Its usual spot is on Yachiyo's shoulder.

Name: Inu-DOOG Gender: ?? Personality: Full of energy. Age: ?? Other: An original dog Kaguya created when she bought a handheld game kit. Since it can be brought along inside Tsukuyomi, they are always together. It doesn't speak and communicates through barks and actions like a normal dog. In reality, it stays inside the handheld game kit, but in Tsukuyomi, it is outside and can be touched.