This is just what I think returning characters in MK6 should look like this time around.

Lets start with Reptile. I think this look would suit him nicely, as a beefier Dragon King crossed with Reptile kinda deal

If Quan Chi should return, I think he should get some new tattoos and some scars from most likely having been defeated in MK:DA, and look a bit like this:

Next, if Robo-Smoke should return, I think he should look bad-ass and be evil as all hell of his own intent, pissed off at what has been done to him. He should drop the cyborg mask and not have an ugly stupid looking human face, he should be more machine than man now. Something like this (On the left. Ignore the pic on the right)

I think Princess Kitana would do good to take a fresh and different turn, and perhaps look a bit more like royalty in the process. Something along the lines of this:

New character concept fun

A new Oni Demon or Boss perhaps was a human at one point, only clue are legs and feet:

One of the Dragon King's High Priests, Servants, or Sorcerers:

New character from a realm of tiger-like people. Perhaps enemies of the Vampire realm or something like that:

A mysterious member of Reptile's long extinct and forgotten reptillian race of men:

That about wraps it up. None of this artwork is my own. It is all done by a guy who goes by the alias Face Zero. Huge props to him for being such a giganticly awesome artist!