Iroha Sakayori is the other protagonist of this work and a high school girl producer who supports the heroine, Kaguya. Name: Iroha Sakayori. Age: 17 (High school junior). Nickname in the story: Iro-P. A busy, hardworking honor student: She attends a prestigious prep school in the city and excels in both academics and sports. She balances part-time jobs with her studies to earn her own living expenses and tuition, leading an extremely busy life. Former Composer: She has a background in music and used to compose her own songs. Due to certain circumstances, she distanced herself from music, but she starts composing again after meeting Kaguya. Hardcore Otaku of Top Liver "Yachiyo Tsukimi": Watching the streams of Yachiyo Tsukimi, the administrator of the virtual space "Tsukuyomi" and a popular AI Liver, is her daily healing. While engaging in fan activities for Yachiyo, she earns pocket money through battle games within the virtual space. Iroha's primary weapon is a giant boomerang equipped with a keyboard, reflecting her talent for music (composition). Transformation Gimmicks and Diverse Attack Styles: As noted in the official weapon blueprints, it is packed with a surprising number of transformation mechanisms. Dual Wield (Blade Mode): She splits the giant boomerang into two swords for speedy close-quarters combat utilizing high mobility. Throwing Attack (Boomerang): She can perform long-to-mid-range area attacks by throwing it directly at enemies. Rushing/Laser Attacks: The weapon is equipped with firing mechanisms, allowing her to fire bullets, lasers, and flying slashes from mid-range. Wire Anchor (Trickery).

A mysterious, energetic, and unconventional girl who came from the moon. She starts her activities as a Liver (streamer) in the virtual space "Tsukuyomi" and aims for the top alongside high schooler Iroha Sakayori (her producer). Characteristics: She appeared as a baby from a rainbow-glowing gaming utility pole and rapidly grew into a teenage girl in an instant. She is selfish and wild but loves Iroha dearly. She performs as a singer in Tsukuyomi. Main Weapon: Multi-functional Bamboo Tube Hammer. Kaguya's iconic weapon is a giant hammer shaped like a bamboo tube. Basic Attack: A close-range power fighter who uses high attack power to grandly swing the giant hammer and crush enemies. Long-range Attack (Unagi Rocket Launch): The hammer transforms into a "Japanese-style rocket launcher" form, firing "Leptocephalus (eel larvae)" creatures she tamed in the story as "Unagi Rockets" for surprise long-range attacks. Movement/Assault Mode: This weapon also serves as a "vehicle" equipped with a rocket engine; by straddling it, she can engage in mobile combat, charging and breaking through the front lines at incredible speeds.

The administrator and top Liver of the virtual space <Tsukuyomi>. She is the "Oshi" (favorite) of the protagonist, Iroha. She uses friendly catchphrases like, "If you're feeling a bit lonely tonight, let Yaccho hear your voice." She is depicted as a character holding important secrets and background information regarding the story and the world of the work.

The charismatic leader of the popular pro-gamer group "Black OnyX" in the virtual space "Tsukuyomi." His public persona is a flashy "Ore-sama" (narcissistic/arrogant) character who loves to entertain the audience, but in reality, he has a calm personality. Nickname from fans: Mikado-sama (Fans are called "Little Bunnies"). Two Sides: He plays a flashy, arrogant character out of a sense of service, but his true face is composed. Kaguya Fan: He has taken a liking to the unconventional Kaguya and has a dedicated side, collecting her videos and merchandise in his private room. Combat Style: His avatar motif in the virtual space "Tsukuyomi" is an Oni. He serves as an attacker in battle, using a Kanabo (war club) as his weapon.

Appearance and Voice Gap: In the virtual space, he uses a very cute girl avatar based on twin-tails and prefers cute clothing. The intense gap of a young man's voice coming from that avatar became a huge topic among viewers. Personality and Playstyle: Generally lazy and marches to the beat of his own drum. However, he has a side that provides abundant fan service once his "switch" is flipped (when he's motivated). Relationship with Brother: The younger brother of Rai Komazawa, who is a member of the same team. A member of Black OnyX.

Affiliation: A member of the popular pro-gamer group "Black OnyX." Personality/Characteristics: Cool, calm, and the quiet type who doesn't say much. While generally composed, he also has a side that can get into the groove of things. Main Weapon: Bashosen (Giant Fan). Transformation/Separation: He can separate this Bashosen into two parts: an "Onigawara" (ogre tile) and a "Shakujo" (monk's staff). Specific Attack/Defense Methods: Defense (Tank): He uses the separated Onigawara as a shield, coolly blocking powerful enemy attacks. Attack/Support: He uses the Shakujo in the other hand to support the team while maneuvering on the front lines.