"I don't appreciate you calling my friend names. Emma may seem tough but she's easily hurt." -Rikki, "Sink or Swim" Emma Gilbert is one of the main characters who became a mermaid in the Australian television series, H2O: Just Add Water. Along with Cleo Sertori and Rikki Chadwick, Emma discovered her powers after her trip to Mako Island. Emma left the main cast after Season 2. She was portrayed by actress Claire Holt in live-action, and Eleanor Noble in animation. Emma is mature, responsible, le