| Ariel | Grace Perkins | |
| Sebastian | Jenisys Oliver-Joseph | |
| Flounder | Luke Anderson | |
| Scuttle | Ava Leahy | |
| Ursula | Charlotte Latour | |
| Flotsam | Katya Kvetkosky | |
| Jetsam | Mirabel Welch | |
| Prince Eric | Connor Burns | |
| Grimsby | Sila Yucel | |
| Chef Louis | Kami Latour | |
| Pilot | Kami Latour | |
| Carlotta | Marcella Smith | |
| King Triton | Cooper Jean | |
| Alanna | Mirabel Welch | |
| Aquata | Kami Latour | |
| Atina | Sila Yucel | |
| Andrina | Katya Kvetkosky | |
| Adella | Harper Cantella | |
| Arista | Marcella Smith | |
| Sailors / Sea Creatures / Lagoon Animals | Harper Cantella | |
| Liam Craigie | ||
| Brady Harlow |