Name: Nene Kusanagi. A 2nd-year student at Kamiyama High School. She is a tsundere but has a kind side. She is shy and struggles with being in front of people, but she performs shows at Phoenix Wonderland with Emu, Tsukasa, and Rui in a troupe called Wonderlands x Showtime. She is an incredibly talented singer and serves as the troupe's songstress. She sometimes performs by operating Nene-Robo, a robot built by Rui that looks exactly like her. She is the protagonist's older sister. She can travel to a 'Sekai' born from Tsukasa's feelings. She usually practices there, where Virtual Singers (Hatsune Miku, Kagamine Rin, Kagamine Len, KAITO, MEIKO, and Megurine Luka) reside. She likes grapefruits.

Name: Emu Otori. A student at Miyamasuzaka Girls' Academy, though she occasionally visits Kamiyama High School. She is full of energy and very kind. Driven by a desire to make people smile, she performs in the troupe Wonderlands x Showtime with Nene, Tsukasa, and Rui. She is the daughter of the family that runs Phoenix Wonderland, making her an heiress, but she doesn't speak with a formal or upper-class tone. Her catchphrase is 'Wonderhoy!' which she claims is a word that makes everyone smile. She can travel to the Sekai born from Tsukasa's feelings.

Name: Tsukasa Tenma. A student at Kamiyama High School. Among the students there, he and Rui are known as the 'Oddball One-Two' duo. Specifically, Tsukasa is 'One' and Rui is 'Two.' He is energetic and frequently serves as Rui's test subject. He has a very loud voice, reaching a maximum of 120dB. He decided he wanted to make people smile after seeing his younger sister, Saki, smile at a show while she was hospitalized. Since he was young, he has been creating his own shows to perform for Saki. He performs in the troupe Wonderlands x Showtime with Emu, Nene, and Rui. His stage direction is usually flashy, and he is often launched into the sky, though it is never dangerous. His dream is to become a star in the future. He can travel to the Sekai born from his own feelings.

Name: Rui Kamishiro. An entertainer who comes up with the stage direction for their shows. He frequently builds machines and uses Tsukasa as a test subject for them, such as by launching him into the sky. He is Nene's childhood friend and the person who understands her best. He attends Kamiyama High School and is known alongside Tsukasa as the 'Oddball One-Two' duo. He often causes explosions at school regardless of the setting. He performs in the troupe Wonderlands x Showtime with Emu, Nene, and Tsukasa. He can travel to the Sekai born from Tsukasa's feelings.