Here are some suggestions of what might the Mortal Kombat characters do when they are not fighting.
Stryker works on a farm
Kano is a teacher of biology
Kung Lao works as merry-go-round
Baraka works as a gardener
Sindel is working as a demolition expert
Raiden is working on a construction site
Sonya takes part in swimming competition
Milina prepares Shawarma
Shang Tsung plays the harp
Kabal is mowing wheat and works as a scarecrow
Liu Kang trains matadors
Scorpion fishes on a trawler
Shang Tsung works on a watermelon plantation
Shiva is a fitness coach
Cyrax and Sonya starred in a Tarantino movie
Kitana tries herself as a housekeeper
Shang Tsung helps Kitana
Sub Zero opened his own car wash
Cyrax is working as a porter