i think Cleo or Rikki! No one say absoulutly not charlotte because that is mean and rude. In the show she can be a little fat and mean but thats in the show, in real life she is not mean or fat. And besides what if you were charlotte and people made fun of you. You would not be happy!, so please don't say mean things!
Rikki , emma , cleo and Bella are good sereias but I stupid fat mermiad she uses her powers against cleo emma and rikki she hate the girls especially cleo