Dullyanna
[10] Knight
I'd imagine Voldo would do well against Asty in close range. As long as you're effective with your TCs, and don't misuse Voldo's stances you could do a lot of damage. If you're good at dodging, you could probably punish Asty hard at mid range. Of course, I don't really use Voldo, so I can only recall stuff from fighting him, and knowing a bit of his moveset.