This was something I posted in the “release ultimats for all characters” thread. I don’t think it needs to be QCF for every character, but it should match one of their individual special moves and utilize the throw buttons.
As for Aria, I would guess it would have to be at least two bodies alive, or maybe a certain overall health percentage across any combination of three bodies, since technically Shadow Jago needs 50.01% of his overall health with both bars combined.