Kaguya is a bright, honest, and kind girl who can get along with anyone. She is highly curious and actively takes on new challenges. She has a compassionate heart and cannot ignore those in trouble, often prioritizing others over herself. Her passion for music is intense, and she wishes to make people smile with her songs. While usually innocent and full of energy, she also has a delicate side that worries about her loved ones and her own fate. She is a charming girl who possesses both kindness and a strong inner core.

Rai is a member of the popular pro-gamer group "Black OnyX" appearing in "Super Kaguya!" and is Noi's older brother. He has a calm and composed personality, rarely showing his emotions. He excels at judging situations quickly and is a reliable presence who can act without panic in any scenario. He cares deeply for his younger brother, Noi, supporting him from the shadows even while being strict at times. His gaming skills are exceptionally high, making him a vital team member who supports the group with precise judgment and stable play. Though taciturn, he has deep trust in his comrades and is depicted as a highly responsible individual.

Akira Mikado is the leader of the popular pro-gamer group "Black OnyX." Possessing overwhelming skill and charisma, he captivates many fans with his confident, "king-like" persona. He loves flashy performances and hyping up the audience, valuing entertainment even in competition. At first glance, he seems aggressive and unapproachable, but in reality, he possesses calm judgment and a sense of responsibility as a leader who holds the team together. He is one of the most popular characters in the story, combining high skill with a spirit of service. He is Iroha's biological older brother.

Noi Komazawa is a member of the popular pro-gamer group "Black OnyX" and is Rai's younger brother. Usually unmotivated and doing things at his own pace, he has a laid-back personality but pours his full effort into the things he loves. He uses a male avatar but prefers cute clothing, valuing his own identity without worrying about what others think. He has a strong spirit of service toward fans and treats them brightly and amiably when he's motivated, making him well-liked by many. His unpretentious personality and unique sense of style are his charms, and he serves as the mood maker for Black OnyX.

Iroha Sakayori is a 17-year-old high school girl. At school, she is an honor student with excellent grades and athletic ability, but in reality, she is a hard worker who earns her own living expenses and tuition. She is usually calm and serious, rarely showing her emotions, but she is helpful and kind, unable to leave those in trouble alone. She has musical talent and can compose, but she had distanced herself from music due to a certain incident. However, meeting Kaguya leads her to face music once again, and in "Tsukuyomi," she takes charge of producing Kaguya under the name "Iro-P." A girl with calm judgment and a strong sense of responsibility, she grows little by little while supporting Kaguya. She is Akira's biological younger sister.