Cleo is kind, cautious teenage girl who turns into a mermaid with water-manipulation powers. She has Thick, wavy-curly brown hair that reaches her mid-back, paired with hazel-green eyes.

Emma is a disciplined, organized, and ambitious former competitive swimmer who turns into a mermaid with the power to freeze water. She has Fair skin, blue eyes, and long golden-blonde hair. She loves the colour blue

Rikki is a self-confessed loner who often speaks her mind. Her edgy attitude contrasts with her friends Emma and Cleo. Beneath her tough exterior, she cares deeply for her friends. She has distinct wavy, curly blonde-to-platinum hair and striking blue or light eyes.

Bella has Honey-blonde hair (worn mostly down and loose) and ocean-blue eyes. Bubbly, energetic, and easy to talk to. Can be a bit naive and trusting, but deeply loyal and caring toward her friends

Lewis has pale skin, blue eyes, and golden blonde hair. He is academically gifted and approaches every problem with a logical, scientific mindset. He constantly risks his own safety and reputation to protect his friends.

Zane is a tall, handsome teenage boy with dark brown hair, dark eyes, and a casual, sporty wardrobe. He is cocky but he can get gentle/protective if someone he loves gets hurt.