MK1 - Raiden, Johnny Cage MK2 - Raiden, Johnny Cage UMK3 - Kabal, Human Smoke, Nightwolf MKT - Johnny Cage MK4 - Fujin, Shinnok, Sub-Zero MK:DA - Johnny Cage, Bo Rai Cho MKD - Bo Rai Cho, Liu Kang, Sub-Zero MKA - Johnny Cage, Fujin, Kabal MK9 - Johnny Cage, Kabal, Sub-Zero
MKX - Shinnok, Goro, Erron Black - but this may change. Depends on how the characters play.