Mileena's creation was through splicing Tarkatan DNA into a Clone of Kitana, apparently there were multiple attempts to get a good clone that would be more Loyal to Shao Khan than Kitana. Kitana saw the other experimental clones herself when walking down in the flesh pits, where Shang Tsung was the one managing the process. Mileena's the one they ended up taking, despite the face she still has the Tarkatan Jaw which she hides under a mask so she can disguise herself as Kitana, the princess of Edenia, another of the Realms, absorbed by Shao Khan.
"You'd never do something as irrational as dying."-Gear sits by Subzero and Cage-
Subzero? This just keeps getting better... are you the first one?
https://www.youtube.com/watch?v=jXkI1sTDoEgHum sorry to hear it. @Cage Ive been over this, me and my brother jump realms, ive been to your universe during the first tournament
https://www.youtube.com/watch?v=jXkI1sTDoEgRight, well at any rate, nice to see a new one. Just dont rip out my spine, im quite attached to it.
https://www.youtube.com/watch?v=jXkI1sTDoEg

mario is red, i am green, i try my best, but everyone's mean