Princess Mermista is one of the main characters in the Netflix original series She-Ra and the Princesses of Power. She is the Princess of Salineas with the ability to control water. Mermista is the "cool girl" and her attitude usually appears to be blunt and unimpressed. She does not mince words when she speaks, but Mermista does have a soft side even if it is hard for her to express her true feelings.