Species: Half unicorn, half changeling
He's usually wearing a black cloak that covers everything below the neck to hide his half-changeling-ness. And that on his face is a 'mysterious mask' he found one day, not markings on his face.
Cutiemark: those three dots and the two curve thing are supposed to represent another universe, to represent his ability of finding interuniversal rifts.
Magic: looks like a magenta color. Basic levitation and teleportation(within 5-7 yards or so). Despite him being half-changeling, he can't really use most of their magic, only being able to use a very disabled version of their transformation abilities, to the point it barely works at all. Ability to find interuniversal rifts. And no, he can't fly, but he can (barely) glide.
Random Equipment: Gaia Blade(a sword he has), generic sword(doesn't usually carry it around.) his mask, saddlebag/sheath, Interuniversal Creature Compendium(it's a book of sorts)
Bio: A stallion born in Fillydelphia, he has almost always wore a cloak of some sort, so everyone thinks him to be a normal unicorn. After his foalhood, he has been wandering around Equestria, but some say he has a residence in Ponyville. Some say he works to find threats from outside Equestria and contain them. He's a little apprehensive about other ponies at first, but he will warm up to them. Despite his cautious and calculating personality, he can be quite energetic. He's not very proud of his heritage, nor does he want to bring it up, so he tries his best to keep it a secret.