Hiyyyya!
This girl is inspired by seaweed! Her hair is made of the lovely plant, and she wears it around her ear and ankle. She has an okapi hood and some stripes, as well as a white hoof, so you could say she is a okapi cross. The magic on her horn enables her to control everything with essence of the sea in it, and the green-blue mist surrounding her is her aura! The cutie-mark is three dots that symbolise:
Darkest one - The depths of the ocean and what it hides
Middle one - The muddy yet golden things you can find in the sea or washed up on the shore, that always have a use
Lightest one - The bright sky that holds the sun, shining down and reflecting on water
If you like her I can give you more information, even a poem and personality! (Unless you want to make that up yourself XD)