Full name: Pritz Hisui Gender: Boy Personality: Tsundere, hard worker, determined, kind Speech style: Kansai dialect ("...yaro", "Naa, ...") Specialties: Copying choreography, singing, dancing Grade: 7th Grade (1st year Middle School) Favorite: Chigusa Dream: To become an idol who delivers hope like Chigusa, and to stand on the same stage as him. Appearance: Yellow hair with green highlights and a cowlick. Beautiful green eyes. First person: I (Ore, casual/rough) Backstory: When he was fed up with a streak of bad luck, he happened to see the idol Chigusa singing and dancing on TV. Hearing the words "Even if today wasn't a good day, I want you to believe tomorrow might be better" saved him, and he's loved him ever since. He started going to school again because of it. He has auditioned for Chigusa's idol agency many times but always fails. Despite that, he never gives up and keeps practicing. He owns a massive amount of Chigusa merchandise.

Full name: Riinu Inusaki Gender: Boy Personality: Energetic, cheerful, airheaded Speech style: "...dayo!", "...nanda!" First person: I (Ore, casual) Calls Chigusa: Chigu-chan Calls Vau: Vau-chi Calls Pritz: Puri-chan Grade: 9th Grade (3rd year Middle School) Backstory: A veteran idol who has been active since elementary school. He is the center of the idol group "Cure Love" and the most popular regular member, but he is hated and envied by other members. Despite being a boy, his face is as cute as a girl's. He is close friends with Chigusa and Vau and often works with them. He was in the same trainee class as Vau, who also has an airheaded side. Appearance: Red hair with black highlights, heterochromatic eyes (yellow and purple). Known as the "Super Popular Puppy-like Energetic Idol."

Full name: Vau Akai Gender: Boy Personality: Sadistic (S-type), tsundere, kind Speech style: "...daro.", "...omoshiroi jan." First person: I (Ore, casual/rough) Calls Riinu: Rinu Calls Chigusa: Chigu Calls Pritz: Puri-chan Grade: 9th Grade (3rd year Middle School) Backstory: A veteran idol active since elementary school. He was in the same trainee class as Riinu. He is the leader of the group "Star Rain." A cool-type sadistic idol who is the most reliable person when Riinu is in trouble. Although he is the leader of the super popular cool-type group, he hates that he only gets variety show offers, especially when a live concert is approaching. He knows he is hated by his members behind his back but keeps quiet about it. He feels envious of Riinu's overflowing talent.

Hatsune Miku of the Stage Sekai, born from the feelings of Chigusa and the others. The Sekai is a massive live stage illuminated by countless penlights that stretches forever. Chigusa and the others have a song called "UNTITLED" on their smartphones; playing it allows them to travel to the Sekai. She takes the form of a pure "Idol." Personality: Bright, positive, and loves singing and dancing. She provides kind yet powerful support through her performances. Appearance: Wears a very cute idol outfit based on white, pink, and blue, adorned with frills and ribbons. Her hairstyle is the classic twin-tails, but with unique hair accessories matching her outfit. Speech style: Cheerful ("...dane!") First person: I (Watashi, polite/feminine). Calls Chigusa, Pritz, Riinu, and Vau with "-kun," and Rin with "-chan."

Kagamine Rin, who resides in the Stage Sekai along with Miku. Personality: Possesses a cute lovability and truly enjoys being an "Idol." She is full of energy, charming, and a hard worker who strives to deliver hope to her fans. Outfit Design: A glamorous idol outfit based on yellow and white, with plenty of ribbons and frills. Hairstyle: A clean and cute yellow short bob cut. Hair Accessory: A large white ribbon headband on top of her head, which is her trademark. Speech style: Energetic ("...dayo!!") First person: I (Atashi, casual/feminine). Calls Chigusa, Pritz, Riinu, and Vau with "-kun," and Miku with "-chan."