tanya's alternate - you have to fight her in outworld at C-2
liu kang's main bio - you get this after you're done with konquest. go where jax was in earthrealm, cross the bridge and go to your left. i forget the grid location but it's in the white lotus society. you'll see liu kang there and his bio is there as well, but i think you have to train with him first or something
the best fatality - probably mileena's head rip cuz i love that seductive laugh of hers
stage fatality - the slaughterhouse one's getting a bit old. i just saw quan chi's fortress' stage fatality. it's pretty cool, but not bloody really. the nexus has one but it's nothing bloody. you just float away. it's probably the dead pool or the kuatan palace that's the best.