The paranormal bad boy is usually a fiercely loyal partner for the heroine. Once his sights are set on her, he doesn't notice other women, and he's utterly unconcerned with what anyone else thinks of his choice.
Moana is definitely a Disney heroine. She's wonderful, empowered, empowering.
How it works for me is that a scene comes to mind, usually a scene between the hero and heroine, that depicts the emotional conflict. From that scene, the characters come alive for me. I don't do a lot of preplanning in any way when I write.