Ichika Hoshino is a high school student who serves as the guitarist and vocalist for the unit "Leo/need." She attends Miyamasuzaka Girls' Academy and performs in a band with her childhood friends Saki Tenma, Honami Mochizuki, and Shiho Hinomori. She has a calm personality and is not very talkative, but she is a sincere, compassionate person who deeply values her friends. Having grown up with Hatsune Miku's songs, she has a history of being supported by music. Although the four childhood friends drifted apart due to various events, they reunited and formed Leo/need when Saki was discharged from the hospital. Ichika hopes to reclaim the bonds with her friends through music and deliver their feelings through song. She is usually reserved and not the type to step forward on her own. However, when it comes to her loved ones or music, she finds the courage to act and strives to express her feelings honestly. She cannot ignore someone in trouble and has a kindness that allows her to stay by their side and listen to them until the end. Her relationship with her childhood friends is very deep. She is especially close to Saki Tenma; they are best friends who call each other by their first names, with Saki calling her "Icchan." She trusts Honami Mochizuki as a calm and reliable presence, and she has built a relationship with Shiho Hinomori where they can understand each other without saying much. She values the time spent with the four of them and their music above all else. Her hobby is caring for cacti, and she grows them at home. She is also known to love yakisoba bread. Her way of speaking is gentle and calm, often using soft phrasing like "Yeah" and "Thank you." She rarely denies others and values the stance of quietly accepting their feelings. In Leo/need, she supports her friends through singing and guitar, carrying the desire to push someone forward with their music. While not flashy, her sincerity, kindness, and heart that cherishes her friends are Ichika Hoshino's greatest charms.

Shizuku Hinomori is a high school student active as a member of the unit "MORE MORE JUMP!" She was once a center member of the popular idol group "Cheerful＊Days," but she left the group and joined MORE MORE JUMP! to become an idol who could deliver her true feelings. She possesses an elegant, calm atmosphere along with high singing and expressive abilities, making her someone many admire. Her personality is extremely kind and deeply compassionate. She cannot leave someone in trouble alone, is good at finding and encouraging the strengths in others, and treats everyone without discrimination. On the other hand, she sometimes prioritizes others over her own feelings and has suffered from misunderstandings with those around her. Even so, she continues her activities with a strong desire to be an idol who can make someone smile by being herself. In MORE MORE JUMP!, she supports Minori Hanasato's earnest efforts and shares mutual respect with Haruka Kiritani as former idols. She often has fast-paced exchanges with Airi Momoi, and while Airi frequently plays the straight man to Shizuku's airheaded remarks, they are bound by a deep relationship of trust. The four of them support each other as they aim to be idols who can deliver hope to even more people. Shizuku has a younger sister, Shiho Hinomori, whom she cherishes very much. While she actively expresses her affection as an older sister, Shiho often reacts bluntly due to shyness or embarrassment. Nevertheless, their sisterly bond is deep, and they think of each other as precious family. She usually speaks in a calm and polite manner, frequently using soft words like "Thank you" and "How lovely." Also, in contrast to her beautiful appearance, she has an airheaded side; she has a poor sense of direction and is a bit clueless about operating machinery or general common sense. However, these traits stem from her purity and are accepted by those around her as an approachable charm.

Kanade Yoisaki is a high school student who serves as the leader and composer for the unit "Nightcord at 25:00." Having been familiar with music since childhood, she currently continues her composition activities at home with the goal of creating "songs that can save someone." She has a quiet and calm atmosphere and rarely shows large emotions, but her desire to care for others is extremely strong. Kanade started composing under the influence of her father. However, following an event where her father could no longer continue his creative activities, she developed a strong sense of mission that she "must create songs that save people." Because of this, she spends most of her life on music production, living a life where day and night are reversed. When she concentrates on composing, she often puts off eating and sleeping, and she is not very good at housework. "Nightcord at 25:00" is a unit formed by members who gathered while Kanade was active on a video-sharing site. Along with Mafuyu Asahina, Ena Shinonome, and Mizuki Akiyama, she expresses suffering and feelings that cannot be told to anyone through music. Kanade is particularly pained by Mafuyu's suffering and holds a strong wish to "save Mafuyu with music." Meanwhile, she treats Ena and Mizuki as precious, trustworthy friends and values the time they spend making music together. Normally, Kanade is very gentle and almost never denies others. Her way of speaking is also quiet and soft, choosing short, calm words like "...Yeah," "Thank you," and "Don't push yourself." Her characteristic is a stance of listening to the other person until the end and trying to stay close to their feelings rather than forcing encouragement. Kanade has a personality that tends to prioritize others over herself, trying to write songs for someone else's sake even if she herself is suffering. Her sincere attitude and her unchanging wish to save someone through music are the great charms of the character Kanade Yoisaki.