America Young as Malibu (Barbie) (voice)

Tatiana Varria as Brooklyn (Barbie) (voice)

Kirsten Day as Skipper (voice)

Cassandra Lee Morris as Stacie / Mermaid 1 (voice)

Natalie Lashkari as Chelsea (voice)

Melanie Minichino as Marlo / Mermaid 2 (voice)

Madelyn Kratzer as Aquaryah Aquavilla (voice)

Tiana Camacho as Talleigha Fishtail (voice)

Vivian Lu as Isla / Dr. Tang (voice)

Johnny Yong Bosch as Finn / Waiter (voice)

Cassidy Naber as Sareena Seasquid (voice)

Angela Lee Sloan as Coralia / Angler Fish (voice)

Jabez Zuniga as Oslo (voice)