'Effy' is a beauty born of sea and sky, she thinks she's a goddess and wont even talk to you unless you sparkle. She is very petty and full of herself and her abilities.  Her father loves her to bits and sees her as his princess, his heir. She Is less a fish cat and more a sky cat always lingering over the shores between the seas and skies. She says mortals aren't worthy of her time but she sure watches them on the beach.  If you call her out on it, she says she's guarding the sea or something important.  

She can breath under water if she wants to visit the sea folk too but is naturally a creature of the air.  Many suiters both sea and land ask for her hand but she hasn't found anyone worthy of being her mate.