Been playing Miyuki for a while and have come to this conclusion: She is a nasty frame-punisher with her EX specials(236AB), Trump card, Climax Arts that can punish from far away and Extended attacks that cover quite a large area. Add in her airdashes for mobility(and her 234 attacks which can surprise people) and her potential that quickly recharges her assist (Kino is quite good since it's hard to react against, recharges fast too, and with her potensial, she can almost spam it) makes her quite good against both offensive and defensive players.
Her 236AB can actually be spammed if you have enough meter so a total of 5 in a row can drain quite much. Kino is for hitconfirm in this strategy.
I think her AB is quite good on wakeup against offensive players to escape from pressure since it makes her go far away from the opponent. Problem is the defensive players, but once you get someone to defend on your wake-up, escaping later is rather simple. Her only problem is her combos are quite easy to either whiff due to wrong timing or dropped frames. Especially her aircombos, but she can combo from almost any air-attack, a feat not to be underestimated.
Yeah, she has so few close-ranged options so she has to keep dodging her opponent to get some distance. She is also pretty slow too so faster characters are something to beware of. Shana and Himeragi espeically are quite a tricky matchup. Those extended Cs also have long recovery time so a jump-in against those are easy damage against her.