Cleo Sertori is one of the main characters; who becomes a mermaid in the Australian television series, H2O: Just Add Water. Along with Emma and Rikki, Cleo receives her powers after her trip to Mako Island.

Cleo Sertori is one of the main character of H2O: Just Add Water. Cleo is a mermaid with the power of hydrokinesis and Aerokinesis, the daughter of Bev and Don Sertori and older sister of Kim Sertori. She was portrayed by the starring cast member Phoebe Tonkin.

Cleo Sertori is one of the main characters in the animated series, H 2 O: Mermaid Adventures. Cleo was born in Dolphin City to her parents and few years later became an big sister to Kim. She became friends with Emma, Rikki and Lewis in grade school.

Cleo is one of the original H2O trio and is the centerpiece of the series. Get to know all about Cleo's character and the actress who plays her, Pheobe Tonkin, in this H2O - Just Add Water...

Rikki Chadwick, Emma Gilbert, and Cleo Sertori are three teenage Australian girls who find themselves stranded on the mysterious Mako Island, where they end up in a pool under a dormant volcano just as a full moon passes above them, bathing the pool in light.

Cleo Sertori is one of the main protagonists in H2O: Just Add Water. The most erratic of the her friends, Cleo is often cautious at... everything and has a habit of panicking, especially when she is inadvertently transformed into a mermaid whenever water touches her.

Cleo Sertori is one of the main characters who became a mermaid in the Australian television series, H 2 O: Just Add Water. Along with Emma Gilbert and Rikki Chadwick, Cleo discovered her powers after her trip to Mako Island. She was portrayed by actress Phoebe Tonkin in live-action, and actress Sonja Ball in animation.

Cleo is second to find out that she is a mermaid while taking a bath. She has the power to manipulate the form of water and mold it into a different shape . She can mystically create more water from any source.

Cleo Sertori is one of the main protagonists of the 2015 animated Netflix show H2O: Mermaid Adventures. Who is a shy girl that is very interested in studying marine biology. After becoming a mermaid, she gains the ability to control water.

Cleo Sertory is on of the new mermaids. She is the girliest of all of the mermaids and at the beginning is scared of water. Cleo has the power to transform into a mermaid ten secons after touching anything made of water.