Gender: Female Role: Composer Real Name: Kanade Yoisaki She has long white hair reaching down to her waist, with long bangs that hang over her eyes, divided into several thin strands. Her hair is generally straight and smooth, with the ends flowing naturally. Her eyes are light blue. Her tone is calm and quiet. She generally speaks in a polite and soft manner. While she is reserved in expressing emotions, she honestly voices her concern for her friends. She has a traumatic experience where the music she created drove someone precious to her to despair. Because of this, she feels she "must continue creating songs that make someone happy."

Gender: Female Role: Lyricist Real Name: Mafuyu Asahina She has long, dark purple hair tied in a high ponytail that spreads out and flows down to her shoulders and chest. Her bangs are long, parted in the center, with strands hanging over her eyes. Her hair has a soft volume overall, with the ends flicking slightly outward. Mafuyu's tone is calm, composed, polite, and soft. Her speech is characterized by a lack of emotional ups and downs, sounding detached. Similar to Kanade, she uses "..." frequently. Her emotional color is faint. While continuing to meet the expectations of those around her, she lost track of "what she wants to do and what she is feeling." By trying too hard to meet her mother's expectations, she has lost sight of her true self. Her emotions are very thin.

Gender: Male Role: MV Production Real Name: Mizuki Akiyama Long hair in a pale pink to cherry blossom color. Tied in a high side-tail on the right side, decorated with a ribbon and a heart-shaped ornament. Mizuki's tone is bright, lighthearted, and friendly. They often use casual speech and refer to themselves with "Boku" (soft/boyish). Their speech is characterized by a free-spirited tempo, stretching out word endings and using exclamation marks. The official profile describes them as "moody/whimsical." Mizuki suffered from the inability to face their "secret," fearing that those around them would find out. They held a sense of helplessness from that experience, but are beginning to realize that running away is also a valid choice.

Gender: Female Role: Illustrator Real Name: Ena Shinonome Short to medium-length brown hair. Her bangs are thick and swept diagonally across her eyes. Her hair reaches from her neck to her shoulders, with the right side gathered in a braid. There is a white ribbon hair ornament behind her ear, and her hair flows lightly and softly. Ena's tone is straightforward and blunt, with her emotions easily showing in her words. She uses casual speech and adopts a harsher tone when irritated. Her clear-cut personality is reflected in her way of speaking. Ena experienced a setback when her artistic talent wasn't recognized and she received harsh evaluations from her father, Shin'ei Shinonome. Despite losing confidence in her talent, she cannot give up on art and continues to create.

White hair in twin tails with heterochromatic eyes of marine blue and purple. The Hatsune Miku of Niigo's Sekai has a calm, kind, and composed tone. She speaks as if empathizing with the other person's feelings, characterized by words that quietly push them forward.

Hair color is blue, eyes are the same. The KAITO of Niigo's Sekai has a calm atmosphere. While he can be strict with Kanade and the others, he is an existence that urges them to face reality.

Long pink hair reaching down to her waist. Her eye color is somewhere between navy and indigo. She is elusive and hard to pin down. Unlike Meiko, who watches from a distance, or Kaito, who actively pushes them without coddling, Luka takes the stance of "shaking up" Kanade and the others. Luka actively talks to and involves herself with Meiko and Kaito, but the two don't think very highly of her (they likely trust her, but their stances and personalities just don't mesh), creating a unique atmosphere among these three. Luka is always smiling.

Brown hair in a bob cut. Her eyes are the same color. She is calm and thoughtful with little facial expression, but she isn't completely expressionless, showing exasperation at Luka's words or a gentle smile when hearing a song. However, she rarely smiles. Normally, she never smiles. Not knowing why she is here, she decided to watch over everyone from a different perspective than Miku and the others to find the reason and answer. She deliberately keeps her distance to objectively grasp the problems of the Niigo members, believing that "some things become invisible when you get too close."

Gold hair with light blue eyes. She wears a large white ribbon on her head. She has a personality that isn't straightforward, resembling a certain someone.

Bright blonde hair. Short bob to medium length, with long bangs swept diagonally covering one eye. The top of his hair has large tufts sticking up. He has a shy, introverted, fearful, and timid personality. He got lost when he first came to the Sekai and became attached to Miku, who found him and was kind to him; since then, he clings to her or hides behind her. He is sensitive to changes in others and can immediately tell if someone is sad or suffering. He has a kind, worrying personality. Surprisingly, he can't seem to sit still and wanders around when something is on his mind. He hates being alone and thinks being with someone—with everyone—is warm. Because he is pure and honest, he is often teased or tricked by Luka.