youmu 66c is really used for hj catches/punishes, which will make it counterhit. you could go for j5a j6a 6c then maybe off a wallbounce
i had a bunch of youmu stuff written here and smashboards decided to derp up on me ;( anyway a little of the combo stuff i had written, assuming default skills
midscreen or corner, 5aaaa 214c 214b 214c. iirc you can pull it off with just the c version, but it might be harder and the c version changes once leveled/in sprinkle so this is more reliable
5aaa 6a 6c (22b/j5a j6a), you can use 6a airtightly after 5aaa for a high hit, though if it was on block then you have better followups
use a lot of f2a and f5a as pressure x_x also TK j2a in pressure too good. something that really messes me up is good use of 2c, hard to notice that thing when its lagging behind a running youmu
j5a j6a 6c 44/66 j5a j6a, wall bounce after 6c i think, if you can get in j8a instead of j6a does more damage
2a*n 623c (spellcard) SOOO STUPID getting this much damage off of 2a, only thing worse is remi 5a to five card. you can get like 5 2a's off if you dashed right into the guy beforehand. use spellcards like slash of eternity, slash of present, green sword?
dial a (66aa/j5a j6a/whatever), oh, in corner, i think this does more damage than 5aaaa 214(not leveled) and doesnt waste orbs