MKHSpartan
[12] Conqueror
For Raph, well if you pick to play him you pick the hard road for a lot of match-ups lol. I do play a bit of Raph myself, Asta does about 3 times your damage but I usually manage to win by using Raph's good variety of TC moves for avoiding throw attempts and poking Asta to death. However with Raph's bad stepkill make sure you play it safe, because Asta's 22B BE is very nasty in this match-up in my opinion.I main Raphael and Pyrrha but just can't seem to get a handle on him with them.
Pyrrha, well she has no bad match-ups lol! Or that is the general consensus. Focus on getting through his spacing with her, the run that offense up close for Asta is way slower than her. Also 22_88K is great for going under Asta's throws for excellent damage, but be wary for Asta's bullrush, it can go under it since it is a high move.
Personally I think if you practice the match-up with Pyrrha you should be able to handle it, and Raph can do it too, it is just harder for him.