Main •
Nathaniel Dass as Nate, the lead singer and songwriter of the Wonderland. • Harry Still as Harry, a guitarist in the Wonderland and the older brother of Oakley. • Oakley Orchard as Oakley, a guitarist in the Wonderland and the younger brother of Harry. •
Kimberly Wyatt as Sasha, the controlling manager of Girls Here First. •
Mya-Lecia Naylor as Mya, a member of Girls Here First who begins a relationship with Oakley. (series 1) • Miriam Nyarko as Miriam, a member of Girls Here First. • Lola Moxom as Lola, a member of Girls Here First. • Lilly Stanion as Lilly, a member of Girls Here First. •
Tillie Amartey as Chloe, a
vlogger and the social media manager of the Wonderland. •
Aston Merrygold as Jordan, the manager of the Wonderland. (series 2–3) • Tyra Rayne as Tyra, a waitress at the Palais restaurant who is asked to be a new member of Girls Here First. (series 2–3)
Recurring •
Colin Hoult as AJ, the father of Harry and Oakley who manages the Wonderland until they are signed to Coleen's company. •
Emily Atack as Meg, the mother of Harry and Oakley. • Simran Rakar as Molly, the younger sister of Nate. • Imogen Chadwick as Elena, the best friend of Molly and eventual social media manager of the Wonderland. • Zina Badran as Anika, the mother of Nate and Molly. (series 1–2) • Ryan Early as Dan, the owner of the Palais restaurant. •
Michelle Gayle as Coleen, the boss of Sasha. She signs the Wonderland to her management company. (series 1–2) •
Luke Fetherston as Fabio, Sasha's assistant and the eventual manager of Girls Here First. •
Stephen Rahman-Hughes as Dev, the father of Nate and Molly. (series 2) •
Victoria Ekanoye as Ashley, the boss of Coleen. (series 2) • Alexis Strum as Helen, the mother of Lola. (series 3) •
Amber Davies as Jess, Dan's younger sister and Lola's coach. (series 3) ==Production==