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Characters: H2O: Just Add Water
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    The Mermaids 

Cleo Setori, Mermaid of Waves

Cleo Sertori (Phoebe Tonkin) is the brunette of the group and a bit awkward, but eventually becomes more outgoing. Her powers are manipulating the shape of water, including the ability to create more water out of an existing amount. She later gains the Razor Wind power.

Emma Gilbert, Mermaid of Ice

Emma Gilbert (Claire Holt), the "leader" of the group, is a rather serious and responsible girl. She has powers to freeze water and manipulate ice, snow, and clouds. Her actress is noticeably missing from the third series; she left to film a straight-to-video prequel to The Messengers.

Rikki Chadwick, Mermaid of Fire

Rikki Chadwick (Cariba Heine) is the "Wild Child" of the group. She is the new girl in town but not a Na´ve Newcomer, because she is rebellious and confident. Her powers initially involve manipulating heat in water (i.e. boiling it), but eventually extend to control over fire and lightning.

Bella Hartley

A mermaid since the age of nine, Bella moves to Mako Island from Ireland in Season 3. Her powers are turning water into gelatine, making water harden into crystal, and to densely compact particles to make substances explode.

    Supporting Cast 

Lewis McCartney

Zane Bennett

Dr. Denham

  • Big Bad: Of Season 1.
  • Hot Scientist: Lewis lampshades that she looks more like a model than a scientist.

Louise Chatham


Miriam Kent


  • Big Bad: Of Season 2.
  • Clingy Jealous Girl: The reason for her hatred of Cleo, which automatically puts her at odds with Rikki and Emma as well.
  • Easily Forgiven: The girls seem to get over the fact that she spent almost an entire season hating their guts and trying to hurt them whenever possible rather quickly.
  • Evil Redhead: At first.
  • Heel-Face Turn: After gaining mermaid powers, she goes completely crazy and tries to kill the girls.

GrimmCharacters/Live-Action TVHannibal

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