Cleo Sertori as Katherine Langford - Which characters would you like to see actors play in live-action Fan Cast | myCast.io
Cleo Sertori
female
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 discovers her powers after her trip to Mako Island.
