Finally, it's done!
This is my impression of King Leo, a future character in the My Little Pony universe I have not yet seen art of! Of course, we lack a description, so this will prbably be more than inaccurate in the future.
King Leo is a charater featured in "My Little Pony: Under the Sparkling Sea", a book set to release this year. (Find it here: [link]
I figured he'd be the equivalent to Neptune for the pony world. He's, after all, cousin to both Luna and Celestia, and part of the 'Cosmic Council'. He's the ruler of the underwater kingdom of Aquastria, where both merponies and seaponies reside!