Windstar
[12] Conqueror
Outside of a few throws/holds from a few characters everything in DOA is relatively easy. I can't speak for the VF guests as I don't play any of them. I know Sarah has a just frame and I think Akira does too.
The buffering system isn't as lenient as it used to be but shouldn't pose any problems after a hour of practice.
"tournament-level" combos are very easy as well. Assuming you figure out how to use the stun system properly in one training session.
Honestly, I still have trouble doing 46 motions in DOA5. The most complex motions in DOA5, however, are the throws. Everything else has pretty lax timing, though the game's own buffering system is pretty hit-or-miss. Things like Akira's SPoD are easier to do in DOA5, yet his 46P+K is harder than in VF5.
Maybe they'll fix it for Ultimate, but I wouldn't hold my breath.