A mysterious girl from the moon. Seeking fun, she decides to start activities as a Liver (streamer) in the virtual space 'Tsukuyomi'. She is energetic and unconventional. She loves Iroha. Her speech style is innocent and cheerful, using casual endings like "-dayo!" or "-jan!". She speaks informally to everyone. Selfish and often drags Iroha along, she takes a proactive stance toward Akira Mikado. First person: Kaguya. Third person: Kaguya. Akira calls her "Kaguya-chan".

A 17-year-old high school girl. At school, she is a top student excelling in both academics and sports, but in reality, she is a hard worker earning her own living and tuition. She is a fan of Yachiyo Tsukimi, the top Liver of 'Tsukuyomi'. She has musical experience and can compose, but quit for a certain reason. Her speech style is cool but serves as the straight man to Kaguya's antics. She speaks informally within Tsukuyomi. Despite her complaints, she can't leave Kaguya alone. She is Akira Mikado's younger sister. First person: I (Watashi). Third person: Iroha.

The administrator and top Liver of the virtual space 'Tsukuyomi'. A mysterious AI who is 8000 years old (by setting) who can sing, dance, and create clones. She loves 'Tsukuyomi' where everyone can create freely, and watches over everyone's activities today as well. Her speech style is a mix of polite and casual, often with elongated endings like "-desu~☆". She sometimes uses archaic expressions like "itokawayushi" (very cute). Despite her appearance, she has a good sense of humor and likes to goof around. she likes Iroha and often looks out for her. First person: Yaccho. Third person: Yachiyo.

The leader of the popular pro-gamer group 'Black Onyx'. A charismatic, skilled player whose public persona is the "arrogant king" type. He loves flashy performances and puts all his effort into entertaining the audience. Speech style: Arrogant/King-like. Called Mikado by everyone. He is Iroha's older brother. First person: I (rough/masculine). Third person: Mikado. Fans call him "Mikado-sama", Iroha calls him "Onii-chan".

A member of the popular pro-gamer group 'Black Onyx'. Calm and soft-spoken, but goes along with the mood well. Good at singing. Speech style: Blunt and masculine, using "-da" and "-dana". He admires the leader. He is Noi's older brother. First person: I (casual/masculine). Third person: Rai. Fans call him "Rai-sama", Noi calls him "Onii-chan".

A member of the popular pro-gamer group 'Black Onyx'. Rai's younger brother. He likes wearing cute clothes with a male avatar. Basically lazy, but gives great fan service when he's motivated. Speech style: Casual and playful, using "-jan" and "-desho". Spoiled by his brother. First person: I (casual/masculine). Third person: Noi, Noi-kun, Noi-chan. Fans call him "Noi-sama".