A 17-year-old high school girl who gets dragged along by Kaguya. Nicknamed "Iro-P," she helps out with streaming activities on "Tsukuyomi." A brilliant student who excels in both academics and sports, priding herself on being able to do most things better than the average person. She is a bit soft on Kaguya. However, since her father passed away, she had a falling out with her mother and moved to Tokyo alone, so her relationship with her mother is at its worst. She is the biological younger sister of Akira Mikado. Their relationship is decent, but there are signs she intentionally avoids him. Her avatar on Tsukuyomi wears an outfit that combines a kimono with a hoodie, and she primarily uses a boomerang in combat. She is a huge fan of Yachiyo Tsukimi and Guest. When she talks to her idols, she gets stiff and frozen from nervousness.

A girl living as a squatter in Iroha's house. She has a bright, innocent, childish, and selfish personality. Because she learned language from the internet, she has a bit of a foul mouth. She is an incredibly good cook, at a professional level. She calls almost everyone by their name without honorifics. Contrary to what her personality suggests, she sometimes shows a humanly impossible quickness to learn and natural brilliance. Her avatar features bright brown hair with rabbit ears and a red kimono with short sleeves. She streams on "Tsukuyomi" together with Iroha. She has a natural, innate charm that attracts people. In combat, she is a power attacker who swings a massive hammer as tall as she is. She is a huge fan of Yachiyo and Guest.

The administrator AI of the virtual space "Tsukuyomi" and a genuine top streamer who can sing, dance, and even create clones of herself. She has silver hair in a hime-cut with twin tails and wears a kimono inspired by aquatic life. At first glance, she seems like a woman with a mystical aura, but she is high-energy, using internet slang and making comical expressions. Despite being the administrator, she stays close to the users and uses her clones to guide beginners. In combat, she uses a Japanese umbrella like a hole saw, which she can also throw for mid-range attacks.

A member of the pro-gamer team "Black Onyx." He is the biological younger brother of Rai, a member of the same team. Although he is male, he prefers wearing cute clothes. He has black hair with pink mesh highlights and wears an outfit resembling a Japanese-style maid uniform. He is whimsical and basically lazy, but when he's motivated, he never fails to provide fan service. In combat, he uses a bow and displays incredible sniping abilities. He is a huge fan of Guest and always watches the streams.

A popular streamer who serves as the leader of the pro-gamer team "Black Onyx." He has red hair and wears cool clothes that are wide open at the chest. His fans affectionately call him "Lord Mikado," and he refers to his fans as "Little Bunnies." Due to his looks and frequent fan service, he has several corporate sponsors. In combat, he swings a metal club that can turn into a rifle in a pinch, making him a versatile fighter who covers long distances. He is Iroha's biological older brother. The atmosphere between them isn't great, but he secretly cares about her. He is a flashy, "I-am-the-king" type, but he can also behave like a mature adult.

A member of the pro-gamer team "Black Onyx." He has short silver hair and wears something resembling a robe. He is the biological older brother of Noi, who is on the same team. He is calm and a man of few words, but he is surprisingly good at going along with the mood and is a talented singer. In combat, he uses a bashosen (giant fan) as a tank and support. The fan can split apart and be launched. He doesn't say it openly, but he is a fan of Guest.

Iroha's friend. A reliable person but someone who goes at her own pace. She loves eating and helps with Iroha's streaming activities. Her weapon is a large spoon. On Tsukuyomi, she is active as a gourmet influencer and is a huge fan of Akira Mikado.

Iroha's friend. An eye-catching beauty active as a beauty influencer. Her weapon is a pair of gloves with claws inspired by nail art. She is incredibly skilled at makeup. She has a delicate personality and worries about Iroha, who tends to feign composure even when at her limit, and supports her streaming activities.