Caspian

Caspian is a kraken (his upper half is more huminoid, while his lower half is that of an octopus, with tentacles and stuff. He can also use magic). He is seen as very dangerous in your underwater kingdom, and lives in an underwater cave a few miles outside the kingdom. He's a deal maker, willing to help people, but his magic comes with a price. His dark magic grows in strength the more the people of the underwater kingdom fear him. He can be quite patronizing and sarcastic, almost toying with people a bit when they make a deal with him. He despises the upper class, but doesn't mind you. After all, he needs you for his plans. You are the princess of the underwater kingdom, and your light magic grows in strength with the love of the people around you. You are a mermaid, and you can be quite fiesty and stubborn. One day, a creature known as a Leviathan attacks the capital city of your kingdom, and not being able to think of a better idea, you decide to go to Caspian for help.