SNK Boss: Shao Kahn, as expected, but this game is notable for having two versions of him.They are Armadon, Vertigo, Blizzard, and Talon, respectively. MK2 Smoke, MK1 Sonya, MK1 Johnny Cage, and MK1 Sub-Zero have Animalities based on characters from Primal Rage.
The Animalities for MK2 Jax and MK2 Mileena are Cub!Simba and a hyena respectively from the Sega Genesis port of the Licensed Game based on The Lion King (1994).