Ondina is a new Mermaid in Season 2. Is played by Isabel Durant. She will be one of the protagonists in Season 2. Ondina starts off in the new season set on her determination to break Zac's connection to Mako. However, throughout the time she spends on land, she realises he isn't as much of a threat as the pod made him out to be.
Ondina is a mermaid from the Mako Island pod who decides that she and Mimmi must go against the mermaid council's rules and run away to drain Zac of his powers.