I would make some corrections to the "rankings" of the courts, making them closer to true noble titles. The English history could also use a little work (history major speaking). But that's a discussion for later.

Could my Ent possibly fill the position for the King of the Spring Court? Though I have yet to see the lore for them, I would imagine that they are less like true fae, and more like an ancient race that mankind has inherited the earth from.