Nightmare - nobody knows where he came from, or who he’s related to, or anything. someponies think that he was created by Queen Scarlet, others think that he might be from a whole other world. regardless of his origin, he is a force to be reckoned with, and is very close to Scarlet and her ways.
 
his abilities include ???, seeming to appear out of thin air, and what appears to be psychic powers of some sort. nobody has been able to spot the latter, though..