Would you like the Skullgirls Endurance system to be adopted in part in the next Mortal Kombat?
In this system it is not possible to change the characters in the combo or to make one continue combo of the other, but you can change the characters at any time and use the other character as a help (throwing a projectile).
In the game you can choose a character (strong) two characters (medium) or three characters (weak) - which in Mortal Kombat would imply in increases or decreases of damage, speed and resistance to damage. It could (with two buttons) we can change character, launch a special, launch two special combined or use as a defense against long combos.
The Variation System could also be used in this adaptation. When you choose three characters, you would have variations. If you choose two each character could have only one variation and if you choose a character you could choose better buffs or have two variations that you could change during the fight.
Thus: Strong: A Character with a Variation. Medium: Two Characters with a Variation or One Character with two variations. Weak: Three characters without variations or a character with all variations.
The System of change of variation would be equal to the one of exchange of personages.