After so long of hiding her secret I reveal what's under Miaka's hat.
She's actually the lost dragon princess Mia.
When she changes into human form she can't fully change her horns or ears. so she wears her signature hat to hide her identity.
Rayne had known from the beginning who she was and had instantly fallen in love with Miaka, and Miaka had instantly fallen in love with Rayne.

Miaka and Rayne © ~zmorphcom