A 17-year-old high school student attending a prestigious prep school while working part-time to cover her living expenses. After being swept up in the antics of Kaguya, who emerged from a mysterious gaming utility pole, she returns to music composition—a passion she had distanced herself from—at Kaguya's request. Under the nickname "Iro-P," she helps with Kaguya's streaming activities. She is a massive fan of the AI VTuber Yachiyo Tsukimi; ever since discovering her and Tsukuyomi through her brother, she has relied on Yachiyo's songs and spent her meager savings on merch to support herself through difficult days. While she acts bright in public, she struggles alone with family issues and the poverty of barely balancing school and work, unable to rely on others. Furthermore, her choice of university and major was made solely to please her mother, leaving her without a dream or goal of her own.

Bright, innocent, and free-spirited. She has a childish and selfish personality and is deeply attached to Iroha. She is highly expressive with big reactions, leading Iroha to initially doubt her identity, wondering, "Princess Kaguya wouldn't be such a social butterfly, would she?" and "Are you really the legendary princess?" She acquires skills like programming, human languages, and cooking at an incredible speed. She can also freely change her hair and skin color, making it clear she is not human. She is particularly skilled at cooking, to the point where Iroha was moved to tears by the deliciousness of her food. On the other hand, she is quite a big spender, buying smart controllers and ingredients from Iroha's wallet without permission and accumulating strange junk even after starting her streaming career.

Claims to be 8,000 years old and has lived since the Jomon period. She always wears a mascot resembling a flapjack octopus plushie on her chest, which synchronizes with her facial expressions. While she initially appears to be a girl with a mystical aura, she has a high-energy side, using unique coined words and making comical faces. At a mini-live event attended by Iroha, she announced the "Yachiyo Cup," a ranking event where all Tsukuyomi streamers compete for the most new fans in a month. By setting a collaboration live with herself as the grand prize, she provided the catalyst for Kaguya to start streaming. She seems strangely invested in Iroha and Kaguya, such as recognizing Iroha despite her being just one user, and siding with Team Kaguya & Iro-P during their KASSEN battle against Black Onyx just one hour before the Yachiyo Cup ended, despite being the organizer.

A charismatic performer who loves flashy productions and puts everything into entertaining his audience. He plays a self-proclaimed "ore-sama" (narcissistic/kingly) character and is called "Lord Mikado" by his fans, whom he refers to as his "little bunnies." In the Tsukuyomi game KASSEN, he is a short-to-mid-range attacker who uses a kanabo (war club) with a golden carrying handle as his weapon.

The younger brother of fellow member Rai Komazawa. He enjoys wearing cute clothing on his male avatar. In the virtual space Tsukuyomi, he wears a gothic-lolita style Japanese maid outfit with white tiger ears and a tail. He is a fickle and lazy person by nature, but he provides plenty of fan service when he's motivated. He loves teasing their leader, Akira Mikado. In KASSEN, he is a long-range attacker using a bow. His accuracy is so high that Yachiyo praised it as "truly terrifying sniping ability." While defeated avatars usually vanish into flower petals in KASSEN, Noi's defeat scenes are uniquely graphic, showing his body being cut in half or his head being pierced, leaning into gore-like aesthetics compared to other characters.

The older brother of Noi Komazawa, belonging to the same team. He is calm and soft-spoken but goes along with the mood well and is a talented singer. Most of his lines in the story are quoted from a "Script for Rai (Updated Regularly)" given to him by Noi. Though hard to see because they are hidden by his avatar's hood, he has bear ears on his head in addition to horns. His motif animal is the polar bear. In KASSEN, he serves as a tank and support, using a bashosen (giant fan) decorated with an ogre mask.

A Tsukuyomi streamer. He hosts a program called "NEWS TSUKUYOMI!!" that introduces the latest topics within the virtual space. While he appears in the story like a news anchor, he actually travels around Tsukuyomi meeting other streamers.

A Tsukuyomi streamer and gaming commentator. Active since the launch of Tsukuyomi, he uses his exceptional talking skills and former pro-gamer experience to provide commentary for various events. He often works together with Otako.