Take this with a grain of salt, but I found this old site, and it's only up to date as far as Mortal kombat 4. Hasn't been updated since.
But they say it's based on the MK cards or whatever - and it has some in depth extra tidbits on the characters that actually doesn't contradict the story as we know it - but at the same time it's also based on a made-up e-mail game the site made up, so bios are made up for characters who weren't in MK4, but the MK4 characters still have the original stories.
And since it says it's based on "MK Kards" or whatever (I remember them from back in the day - based on MK3 -, they had the Midway logo. but I can't remember if they had story tidbits - I just remember they had game tips)
So I was just wondering if any of the info was accurate. Yeah, I know this is reaching and stupid, but I was just curious.
http://www.geocities.com/TimesSquare/Portal/4748/profiles.html