Mysterious Master (Patreon)

She has told you that she was raised by monks in a secluded temple in the Far East. You have no reason to doubt her, but it doesn't exactly explain how she has such massive muscles and is as tall as even 'tall' men. You also get a primal instinct, whenever she moves any part of herself in your direction, that screams "RUN!" to your subconscious when you are anywhere near her. Lately a thought has slipped into your mind a few times. You've heard tales of ancient dragons, some stories saying they reside at the bottoms of great bodies of water, and you can't help but wonder if she might be one.

The story with this one basically came from the mark on her forehead. I saw it was an option for this character and thought it looked cool, and then worked my way to her backstory from there as an explanation for it.