My idea basically combines the 2 most popular sub races for the forsaken; skeletons, and dark rangers, with just a little pinch of abomination and San'layn(I apologize for any walls of text)
I like to call them the Faded, they are a group of forsaken, that abandoned the war effort against Arthas in favor of flying around in Scourge Necropolis, no idea what it'd be called, but basically the Necropolis they stole served as basically a fridge for the scourge, if your fridge was filled with corpses, the souls of the bodies were instead used for shades, the leader of the Faded Undead tried to create a ritual, using druidism and necromancy, to perfect the connection between their souls and bodies, but instead made it so they could control their soul and to be able take over other corpses as long as they weren't inhabited by another soul(though, they do connect to these corpses perfectly, which prompted their leader to name the ritual a success), It however also made their original bodies very brittle(to the point of being unusable for anything really), requiring the leader to use skills he learned as a surgeon in life to create new bodies for the Faded(which they decided on because the images of their souls resembled faded forms of the last body they inhabited) the male Faded have a resemblance to a abomination with a structure similar to a skeletal warrior, with a taurens hooves(they have the leg structure of humans, think like Illidan's legs) a troll's right hand and an orc's left hand, while the females look very much like dark rangers, but with stitches and certain parts from other races(i.e. trolls/other elves), you would find the Faded in the far north, in the same place Death Knights get their legion class mount, the leader of the Faded (who witnessed Death Knights resurrect the dragon) chose this location as a permanent settlement since the extreme cold keeps them from rotting
Customization;the have several different hair options, several rot like skin colors with different stitches(need to have skin, it's the reason pure skeletons aren't a viable race option, and it gives the Chinese an easier time censoring), while the males will have the options of different types of heads(troll, elf, human and orc) and beards, while females will be able to have the option of having the skin of different races grafted on their face(mostly the more "human" races), both could possibly get a necklace, which could be explained as having an enchantment that preserves their bodies from decay
Heritage armor: something sort of similar to scourge architecture, sort of like what lichs wear, sort of an dark Egyptian theme maybe with a hood(can't have dark rangers without hoods) or possibly something similar to the concept art for the hunter tier set 8 armor(again with a hood)
Racial abilities;
*Haunt: Briefly leave your body to fear target for 3 sec, 2 min cool down
*Imbued: taking or dealing damage has a chance to deal a small amount of arcane damage to enemies
*Anomaly: reduces shadow, frost, and nature damage by 1%
*Apothecary: an understanding of the nature of chemicals gives you +15 alchemy
*Shade:when dead, takes the form of a shade(looks sort of like void form, but you're deep black, with red eyes), giving you +40% movement speed and giving access to a couple, non-damaging abilities(world appears purple instead of standard light blue, your character appears red, and other ghosts appear yellow, special dialogue with spirit healers(they appear as normal); "it seems you underwent the ritual, though I cannot revive you, I can bring your body here, I believe you can do the rest yourself, though there will be some damage to any armor your happen to be wearing")
**Unescapable chase: teleport to targeted destination within 20 meters
**Séance: allow speaking to ally for 4 minutes
Classes: Warrior, hunter, mage, monk, priest, warlock, rogue, and Druid(I said the ritual that made them combined druidism and necromancy)
Mount: improved skeletal horse, or undead bear, or Plague-dog(Gluth)