We've had a lot of dumb hypothetical threads here lately, I thought this might be an opportunity to get some dialogue going about all these possible descendants they keep hinting at;
Possible couplings (based on known canon):
Sonya x Cage - Actual survivors of MK9, its known (whether they're still alive or not) they got together and made Cassie
Baraka x Mileena - Also survivors of MK9, had a thing for each other in previous timeline. Forx, anyone?
Reptile x Khameleon - Same species, unclear how long they actually live or how they reproduce. Its not impossible for them to write soem sort of asexual reproductive nonsense into Zatarrans either way.
Liu Kang x Kitana - Long standing couple, unfortunately both dead so not a lot of opportunity there but definitely likely.
Nightwolf x Sindel - What happens in the glowing pillar of light stays in the glowing pillar of light, see: Drahmin's ending in MKDA.
Rain x Tanya - Edenians are pretty timeless but both of these characters are worthless on their own, so this could be an opportunity to get two birds stoned at the same time.
Any others? Sheeva, Quan, Shinnok, and Ermac all survive MK9 but 25 years would be meaningless to them and htat would be one ugly orgy. Who else do you think could or would have had kids?