Since we frequently experience a story through the heroine’s POV, it helps us connect with her if we really like her. If we can relate to her, or would love to have her as a friend, or family member. And heroine’s come in all different personalities (bad-asses, damsels in distress, naive, jaded, etc…) but we truly get a kick out of the spitfires!
Doesn’t mean they can’t be vulnerable or sensitive, and flawed. But we love it when she has a great sense of self, a sense of humor, she’s compassionate, and loyal, but knows when to put herself first.