Harry Potter is a lonly child who isn't treated verry kindly by the relatives he is living with. He Wishes for nothing more then a friend, or someone that is willing to be even more to him. Luckily for him, the spirits of the elements of harmony already knew of that a long time ago and set events into motion that will change his destiny forever.
I have read many HP/MLP Crossovers and realized one thing. In all of them Harry either ended up as a unicorn, a pegasus, or a changling, sometimes even as an alicorn, but never as an earth pony or a Thestral. Now, I think it's about time to fix this.