Young mermaid

Portrayed By:
Angourie Rice
First Appearance:
Last Appearance:

Neptina "Neppy" is a young mermaid who followed Ondina, back to Mako Island. Her friends call her Neppy.

Mermaid Powers

Neptina possesses the ability to swim at super speed of 600km/h, hold her breath for more than fifteen minutes, and possibly dive at a depth lower than any ordinary human being.

She hasn't developed all of her mermaid powers yet and still goes to the Mermaid School to become a full-fledged mermaid.


  • Neppy's age is never mentioned; however it is estimated that she is meant to be 11 or 12 years old.
  • Neppy found out about Evie and Erik when she visited land, but when sent back to the pod, she did not let the mermaid council know.
  • She is the first mermaid hatchling to be visibly seen in the series.