Mortal Kombat 11 DLC: 10 Old-School Characters We Want To See
1. Onaga
The almighty Dragon King, the conduit in the which the One Being - the creator of all the realms - flows through, the predecessor of Shao Kahn himself, Onaga. So powerful, he didn't make an appearance until the *counts fingers* sixth main entry (cameos notwithstanding).
Pettiness aside, Onaga is a badass and feared to be unstoppable during his reign. The combined efforts of Quan Chi, Raiden and Shang Tsung couldn't defeat him, and even his successor feared him. As with most emperors, Shao Kahn poisoned him instead.
Whilst not playable in any iteration (through normal means), Onaga is a powerhouse on par with Jinpachi Mishima or Azazel from Tekken.
Perhaps with all the time-bending shenanigans going on, maybe a once-thought dead Onaga could seek to redeem his throne from the usurper who took it.
Cetrion could try and use that against Shao Kahn and his unlikely allies/enemies, attempting to rule supreme.
We can only wait and see.