This is Tide, a merwoman knight. I played her in a tabletop RPG, specifically FATE!
Name: Rising Tide, Tide for short.
Her actual birthname is pretty much unpronouncable.
Tall, strong, sleek, half-fish. Taking her headfin into account, she tops two meters. While pretty fast on land, she is terrifying in the water.
High Concept: She Speaks For The Seas
A young noblewoman and a knight, Tide was sent by her father, the high chancellor of the Deep Kingdom, to represent it in the affairs of Trinity Bay.
Her job is to protect the kingdom’s interests in anyway she can and chooses… She usually chooses trouble. Why was the daughter of the high chancellor sent to this remote town? She doesn’t know, and she is not pleased! And just when she was getting on so well with the crown prince Dagon.
She was going to have dinner with the royal family. Could you have thought of a worse time, father?
Trouble: Imperius Regina
Let’s be honest here, Tide is something of a douche. She is highborn and she knows it, and she doesn’t care much for the surface world. She is quite adept at rousing the ire in others. The Deep Kingdom is almost a caste society. Tide herself comes from the military ruling class. The royal family themselves might or might not be Lovecraftian horrors.
…You Get Paid?
Tide was born and raised for battle. Upon arriving to Trinity Bay, she quickly got interested in the gladiatorial fights.
One day, she noticed Dragonheart being placed in an unfair match and decided to get involved. As a mysterious hooded figure, she has interfered in his matches ever since. She might not have fully realized that the matches are staged.