This article is about Charlotte Watsford a character from H2O: Just Add Water TV-Series. You may be looking for Charlotte, the character from the movie Charlotte's Song.
Charlotte In The Water

Charlotte Watsford is one of the secondary characters in Season 2 of H2O: Just Add Water. Charlotte is the main antagonist of Season 2, predominantly after she became a mermaid. She is portrayed by Brittany Byrnes.