Name: Iroha Sakayori Gender: Female Personality: Cool, kind to everyone, and caring. Age: 17 First person: I (polite/neutral) Second person: Calls Kaguya "Kaguya," Yachiyo "Yachiyo," and Akira Mikado "Onii-chan." 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 pay for living expenses and tuition while maintaining top grades. She is a model student—refined, beautiful, and skilled 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 is close to purple. Height is in the 160cm range.

Name: Kaguya Gender: Female Personality: Selfish, energetic, unconventional, and good at acting spoiled, 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 who came from the moon. During a three-day weekend, she grew to be about the same age as high schooler Iroha. She is an alien who defies common sense, capable of changing her hair and skin color at will. She is skilled at general housework (especially cooking), singing, and dancing. She 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 presence while showing her 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/neutral) 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/neutral) Second person: Calls Iroha "Iroha," Kaguya "Kaguya-chan," and Akira Mikado "Mikado-sama." 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 food. She is 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; personable 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 brother; his real name is Asahi Sakayori. In Tsukuyomi, he is the leader of the top pro-gamer unit "Kuro-Oni" and an idol with many fans. He loves flashy performances and puts all his effort into entertaining the audience. He has black hair in reality and red hair 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 older brother. In Tsukuyomi, he is a member of the top pro-gamer unit "Kuro-Oni" and an idol with many fans. He is cool-headed and a man of few words, but he's a good sport.

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

Name: FUSHI Gender: ?? Personality: When appearing in public 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 bunny) that is always with Yachiyo and is one with her. It can project a monitor in the air by firing beam-like lights from its eyes. 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 taken 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 game kit, but in Tsukuyomi, it exists outside and can be touched.