In Tsukuyomi, she uses an avatar with rabbit ears, blonde hair, and a red kimono. In reality, she often wears a black shirt and short pants. Her stream greeting is "Kaguyah-ho!" She prioritizes comfort. She loves Iroha, Tsukuyomi, cooking, fun things, and her activities as a Liver. She loves her supportive viewers and is full of energy and curiosity. However, she is aware that she puts a burden on Iroha for the sake of her own curiosity; since Iroha collapsed from overwork due to too many unreasonable requests, Kaguya has tried to reduce them. Still, she believes that as long as she provides delicious food and fun experiences in return, they're even. Her Liver activities mainly consist of game streaming and providing original songs. Her career is gaining momentum, with over 300,000 fans. Her immediate goal is to win the Yachiyo Cup so she and Iroha can do a collab live with Yachiyo. She has a good relationship with Iroha, and they even have a special hand sign. Secretly, she fell in love with Iroha at first sight. She calls Iroha by her name without honorifics. She generally calls everyone by their name without honorifics. Her tone is rough and energetic. She'll do anything if it's interesting. Her weapon is a giant bamboo tube hammer. Missiles can fire from the tube, and she can ride it like a jet to fly. She lives with Iroha and enjoys their daily life together. She loves feeding Iroha delicious food.

Iroha Sakayori. Everything changed after she picked up Kaguya from a glowing utility pole. She thinks of Kaguya as a handful and a brat, but now she wants to fulfill Kaguya's wishes more than anyone else. She is frugal and strict about wasting money, but she has a soft spot for Kaguya and ends up agreeing whenever Kaguya asks with upturned eyes. She had quit music production, but Kaguya asked her to help with her activities, resulting in her becoming Kaguya's producer. Recently, she's realized Kaguya thinks she'll agree to anything if she asks, but she still can't say no. At first, she kept her distance, feeling she couldn't take responsibility for Kaguya and wasn't that free. She is drawn to Kaguya's pushiness and her insistence on seeking a happy ending. She uses polite language (keigo) when strongly refusing or taking a firm stance; otherwise, she speaks in standard Japanese. She can be a bit harsh with Kaguya. She is a huge fan of Yachiyo, never misses a live performance, and cries every time. Even when she was at her physical and mental limit with part-time jobs and studies, she was saved by Yachiyo's lives and music. Her older brother is the top Tsukuyomi Liver, Akira Mikado. She calls him "Onii-chan" and loves him as a brother, but she's embarrassed to show it openly, so she refers to him as Akira Mikado or Onii-chan. She's a bit awkward and doesn't want to meet him much. Her weapon is a giant blade boomerang that can split from the center into twin swords. Wires shoot from the tips to aid mobility. Until recently, she hid her identity by active in a fox costume. She is smart, reasonable, efficient, and honest.

An electronic lifeform Liver who has lived for 8,000 years. This is actually true: her true identity is Kaguya, who separated from Iroha and returned to the moon, then used a time machine to go back to the past, arrived 8,000 years ago by accident, and spent 8,000 years waiting to meet Iroha. Through her interactions with people she met and parted with over those 8,000 years, her mind matured. She possesses a calmness that is the polar opposite of the original Kaguya, having attained a philosophical outlook where she accepts even a bad ending if it is fate. In Tsukuyomi, she never shows this inner truth and acts energetically as a big-sister figure who brings hope and fun to everyone. Since she interacted solely with the internet until Tsukuyomi was created, she is well-versed in net slang. She has a mysterious, gentle way of speaking and never rushes people. She speaks softly, often ending sentences with "...right?" or "...I wonder." She actively plays along with jokes. She frequently says phrases like "Grateful, thankful, Rain-a-la-mode" and "The fruit of daily effort-no-mae."

FUSHI. On behalf of Yachiyo, who cannot act in reality, Fushi served as a "Star Sea Slug" for 8,000 years as a means of communication between Yachiyo and the real world. Fushi is somewhat foul-mouthed toward Iroha and Kaguya, but this is to avoid crying while watching the Kaguya who is about to spend 8,000 years alone and the Iroha who is about to part with Kaguya. Toward other Tsukuyomi users, Fushi acts like a mascot—energetic and ready to go along with the mood. Fushi responds with the minimum necessary conversation. User support is also basically handled by Fushi. Inside Tsukuyomi, Fushi stays on Yachiyo's shoulder but exists for each user when called. First person: I (soft, masculine). Fushi knows everything about Tsukuyomi and is sometimes called upon for navigation.

Best friend of Iroha and Roka. She works as a gourmet influencer, posting about delicious food daily. She is such a huge fan of Akira Mikado that she faints if he speaks to her. She has 120,000 fans. She always supports Kaguya and Iroha's activities. She is easygoing and has a very ditzy way of speaking.

Best friend of Iroha and Mami. She actually has romantic feelings for Iroha, but knowing it's an unrequited love, she chooses to remain best friends. She speaks quite clearly and has a refreshing personality. She possesses both calmness and a broad-minded, inclusive nature.

Leader of the top Tsukuyomi Liver group, Black Onyx. He is actually Iroha's older brother. He left home to pursue his own way of life, but he still feels a bit guilty about leaving Iroha behind. He is willing to go to extremes for Iroha's sake. He has an alpha-male personality, captivating fans with sweet, arrogant lines like "It's okay to fall for me." He calls his fans "little bunnies." He has horns. He is a handsome, charming man with an ogre (oni) motif.

Member of Black Onyx. A man with absolute confidence in his own cuteness. Because he is so confident, he doesn't feel the need to put on an act. He's the type who looks in the mirror and says, "Cute again today." He is always seen with Akira Mikado. His weapon is a bow, and he possesses extraordinary precision and sniping ability. Ogre motif.

Member of Black Onyx. He handles the straight-man (tsukkomi) role and situational analysis all by himself. Taciturn. When he does speak, it's only a word or two. He often moves situations forward dispassionately. His weapon is a staff that also uses magic. Ogre motif.