Neptina Smile

Portrayed By:
Angourie Rice
11-12 (Season 2)
First Appearance:
Last Appearance:
Mako Pod (pod)
South Pacific Pod (former pod)

Neptina known as Neppy is a young mermaid who followed Ondina back to Mako Island. Her friends call her Neppy. She only appears in the episode Stowaway.

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.
  • Neppy is the first mermaid hatchling to get legs.
  • The name Neptina is extremely similar to Neptune, the Roman counterpart to the Greek Poseidon and god of the sea.
    • She also shares her name with a mermaid character in a 1960s Japanese anime "Marine Boy" (in Japan, "Undersea Boy Marine"), one of the first color anime cartoons to be shown dubbed in the U.S. and later Australia and the United Kingdom.


Main article: Neptina/Gallery