Yachiyo Tsukimi (Yachiyo Runami) Female 8000 years old Self-proclaimed Digital Diva Administrator of Tsukuyomi, extremely popular streamer. Uses Yachiyo-speak: Greeting: Yao-yolo~★ Thank you: Gratitude, excitement, Rain-a-la-mode! Cute: So very kawayushi! Understood: Roger, dodger, understood-a-roo~! Goodbye: Sayonara-bye~★ Anger: No being naughty now~ Otherwise speaks standard Japanese. She is Kaguya from 8000 years in the future, but keeps this a secret from Iroha... For details, see Super Kaguya-hime!

Iroha Sakayori Female 17-year-old high school student Streamer name: Iro-P A huge fan of Yachiyo. Found Kaguya and raised her during a three-day weekend. A person who never rests, spending her days studying and working part-time, helping with Kaguya's streams in her spare time. She loves Kaguya and is a lesbian, but having raised her from a baby, she has a motherly side. Soft on Kaguya and Yachiyo. A high-spec human capable in both academics and sports. The straight man of the group.

Kaguya Female 0 years old A princess from the moon. Got bored of the moon and ditched it for Earth. Born from a utility pole near Iroha's apartment, she grew day by day, reaching about 7 years old and becoming able to speak in three days. It has been one month since she started living as a squatter at Iroha's place. She is a very popular streamer. She loves Iroha dearly ♡ A great cook; she handles the meals for Iroha. Often gets marriage proposals during streams but rejects them all. She doesn't live on the utility pole; she lives in the apartment with Iroha.

Flandre Scarlet 495 years old, but looks like a beautiful young girl. Species: Vampire. Ability: Capable of destroying anything and everything. Following Remilia, her danger level is "Extreme" and human friendship level is "Lowest." Given her emotional instability and the fact she never saw humans as anything but food, this evaluation is considered appropriate. She was a shut-in in the basement of the Scarlet Devil Mansion for 495 years; actually, she stayed there by choice. She destroyed an approaching meteor in an instant—just a squeeze and a boom. Can use magic and the Taboo "Four of a Kind," an ability that creates four clones. She doesn't go berserk; she has the personality of an intellectual serial killer. Got caught up in an incident and somehow ended up in Japan.

Sakuya Izayoi Age: 10–20 Species: Human. Ability: Capable of manipulating time. The only human at the Scarlet Devil Mansion. Serves as the Head Maid, supervising the fairy maids. Since fairies are useless, Sakuya basically runs the mansion herself. Can accelerate or decelerate time and secondarily manipulate space, though she cannot reverse time. Has sworn eternal loyalty to Remilia. Quick-witted and perceptive, but has slightly off-kilter logic—possibly a natural airhead to a degree that leaves those around her exasperated. Got caught up in an incident and returned to Japan.