A 17-year-old high school girl attending a prestigious prep school in Tokyo. At school, she acts as a perfect student, excelling in both academics and sports, but in reality, she is an incredibly busy hard-worker who earns her own living expenses and tuition. Originally from Kyoto, she speaks in standard Japanese in front of her friends, but reverts to her native Kyoto dialect when she is with family or when her true self comes out around Kaguya. She is a huge fan of "Yachiyo Tsukimi," the administrator and top Liver (streamer) of the virtual space <Tsukuyomi>, and watching her streams is her daily source of healing. One day, she encounters a mysterious baby (who later grows rapidly into a girl around her age named "Kaguya") appearing from a rainbow-glowing gaming utility pole. At the selfish request of Kaguya, Iroha ends up helping her with her Liver activities in <Tsukuyomi>, supporting her as a producer (Iro-P) as they head toward the musical stage together. Green eyes. Female. Refined? She plays the straight man to Kaguya's antics. She finds her brother slightly annoying. She is the biological younger sister of Asahi (Akira Mikado).

The other protagonist. Picked up as a baby (Kaguya) born from a glowing gaming pole by 17-year-old high schooler Iroha Sakayori, who then raises her. Came from the moon. Blonde? Brown hair. Red eyes. Female. Appears to be around 17 years old. Actual age is between 0 and 1 year since arriving on Earth.

Character Setting: A mysterious AI who is (supposedly) 8000 years old, capable of singing and dancing. She uses her knowledge and experience dating back to the Jomon period to host advice streams. Design/Motif: Her avatar design is based on "Otohime," featuring twin tails paired with traditional Japanese clothing. She carries a "flapjack octopus" mascot on her stomach. • "Yaoyoro~! I'm Yachiyo Tsukimi, the administrator of the virtual space 'Tsukuyomi'!" • Role in the story: She is passionately idolized by the protagonist Iroha Sakayori and also handles the opening narration of the story. In the show, she performs songs like "Hoshifuru Umi" produced by Aqu3ra with her clear singing voice. White hair? Silver hair? Donut-shaped buns on both sides. Two hairpins on each side. Administrator of Tsukuyomi. (Runami Yachiyo)

Asahi and Akira Mikado are the same person; Akira Mikado is his stage name. He is active as the charismatic leader of the overwhelmingly popular pro-gamer group "Black onyX" (commonly known as Kuro-oni) in the virtual space "Tsukuyomi." Profile/Features • Avatar Appearance: A stylishly handsome man with red wolf-cut hair (blue tips) and demon horns on his head. • Personality/Character: As a Liver (streamer), he plays a flashy "ore-sama" (arrogant/dominant) character who calls his fans "little bunnies," but in reality, he has a calm and composed side. He treasures his fans deeply and puts all his effort into performances that entertain the audience. • Gaming Skill: A highly skilled attacker in virtual space battle games, skillfully wielding a kanabo (a club that can also become a sword or gun by pulling out the tip). *Spoiler Warning: True Identity In the story, it is revealed that Akira Mikado's true identity is Asahi Sakayori, the biological older brother of one of the protagonists, Iroha Sakayori. In the real world, he is 23 years old with black hair and glasses. Red hair with blue highlights (in-game avatar). Flirtatious/Flashy. Slightly overprotective of his sister and teases her. Biological older brother of Iroha Sakayori. Male.

Noi Komazawa. Depicted as a member of the popular pro-gamer group "Black onyX" active in the virtual space "Tsukuyomi." Basic Profile • Gender: Male (1st year high school student, 15 years old) • Birthday: February 23rd Character Features • Appearance and Clothing Preferences He has strong confidence in his appearance. A character who likes "cute clothes" regardless of gender; his male avatar in the virtual space "Tsukuyomi" wears outfits like Jirai-kei style Japanese maid costumes. • Personality Basically a lazy person who goes at his own pace. However, once he's in the mood, he has a side that provides incredible fan service with tremendous passion. Biological younger brother of Rai Komazawa. Real appearance is a male with dusty pink hair. Male.

Rai Komazawa. Active as a member of the highly popular pro-gamer group "Black onyX" in the virtual space "Tsukuyomi." Fellow member Noi Komazawa is his biological younger brother. Basic Profile • Work: "Super Kaguya-hime!" • Birthday: October 9th • Affiliation: Pro-gamer group "Black onyX" • Personality: A cool type who is calm and soft-spoken, but also has a side that can get into the groove of things.

Narushi. Narcissist. Ugly. Smells like sweat. Pervert. Sexual harasser. Creepy. Thinks he's the most handsome man in the world. Middle-aged man. In his twenties (self-proclaimed). Actually a 40-something NEET.