Rita is the School Principal and a Mermaid who started a new life after her husband died. She has only told one person about her secret. She has the ability to reveal invisibility which she used on Zac while he was hiding in her office to steal the test results for Evie.
Kerith Atkinson potrays Rita. She first appeared in Meeting Rita and her latest appearence is Decision Time. It is unknown if she is in Season 2.