Akito appears to be an easygoing guy at first. However, his personality drastically changes when music is involved, becoming hot-blooded and passionate to the point where people find him scary. He respects anyone who is passionate about their interest and hates half-hearted people. When Akito was in elementary school, he quit soccer because he lost an importand soccrr tournament. Then, some time after he quit playing soccer, his sister Ena brought him to a summer festival where she encouraged him to try singing. This kickstarted his interest in street music, which eventually grew into the dream of surpassing the legendary music event RAD WEEKEND. He looks up to Shiraishi Ken, An's father who performed in RAD WEEKEND, and practices hard to achieve his dream. He sang together with Toya under the name BAD DOGS before forming Vivid BAD SQUAD with An and Kohane. Even after joining Vivid BAD SQUAD, he still operates under the BAD DOGS unit with Toya.

Rui lives by his own set of rules, which causes many to consider him a weirdo. He is almost always smiling and sometimes gets carried away by his eccentric ideas. Despite the apparent riskiness of his ideas, Rui does his best to take safety into consideration. Rui and Nene are neighbors and childhood friends. Rui was the one who recommended she join Wonderlands x Showtime. He manages the group's stage performances and is both an actor and stage director. Rui is also very skilled in inventing machinery and creates animatronics for the shows, including NeneRobo. When Rui was young, he loved to create shows and tried to include his classmates in them. However, due to his eccentric nature and risky ideas, his classmates grew to dislike doing shows with him and pushed him away. Rui eventually decided that he would perform shows on his own, using robots as his actors instead of real people. Rui performs with Tsukasa, Emu, and Nene in Wonderlands x Showtime. He hates vegetables.

Toya is quiet and calm but has a strong mind. His face is often deadpan, and people other than Akito and Tsukasa have difficulty reading his expressions. When people talk to him, they usually mistake him for being rude, as he is blunt and often misphrases his statements. Until becoming part of Vivid BAD SQUAD, he wasn't one to smile frequently. Despite his stoic demeanor, he is kind and quick to help others. He can occasionally be airheaded or gullible. Toya's father is a popular classical musician and would isolate Toya and force him to study classical music at all hours of the day, causing him to despise his father, and by association, the entirety of classical music. As such, he started performing street music to rebel against his father and eventually met Akito while singing on the street. He sang together with Akito under the name BAD DOGS before forming Vivid BAD SQUAD with An and Kohane. Even after joining Vivid BAD SQUAD, he still operates under the BAD DOGS unit with Akito.

A theater show he saw as a kid impressed him so much that he made it his ultimate goal to become the greatest star in the world. He's a supportive brother to his frail younger sister, Saki. Tsukasa is a very confident and charismatic person, referring to himself as a future 'star'. He has a notable habit of showing off, alongside a tendency to get caught up in the moment. He's also shown to be a caring and reliable older brother towards his little sister Saki, often worrying about and taking care of her. Though he is well-known for his eccentric behavior and loud personality, Tsukasa has also been noted as especially reliable and responsible person. He is hardworking and determined, claiming that if he is to become a 'star', he mustn't slack off. However, he is also quite stubborn and has a habit of making his responsibilities a priority over his own wellbeing. He performs plays in Phoenix Wonderland with his group Wonderlands x Showtime, also known as him, Rui, Emu, and Nene.