Cleo Sertori Cleo's a bit shy and awkward, but with the help of Emma and Rikki, she quickly gets over some of her biggest fears. Before she became a mermaid, Cleo was afraid of swimming, but now she's mastered her powers and her fear. Cleo's been known to put her foot in her mouth (over and over and over again), but she always has the best of intentions.
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