Personally I use morrigan and akuma.
Either way, it's Team Demon.
Dante (Jam Session)
Dormammu (Dark Hole)
Morrigan (Shadow Blade) | Akuma (Tatsu)
I was looking for an assist that I could use like dat50sent's low to high diagonal sent force assist for unblockable setups (someone from GAF was doing this with sent and Wesker's srk.L). I also thought of changing Morri/Akuma out for Ammy, but I just don't like how Ammy feels... so I can't justify her for cold star. The only other besides Ammy and Sent that came to mind was potentially Doom or Iron Man and I don't like those two either.
If anyone has suggestions on a third that I could try out for an unblockable teleport mixup, I'd be willing to slot them in.