Oh shoot im late lol
Gonna write my thoughts on rosa and DDD since I have decent experience against both characters
We have MANY ways of getting rid of luma which are Dash attack, last hit of bair, simple jab combo, fair (when luma already has some percentage stacked), heck we even have dash attack to back air as a true combo on luma just to get rid of it.
Putting that aside the MU will be all getting rid of luma and catching rosa when shes playing defensive, when she DOES have luma, she can make it pretty hard to catch her and can throw out a lot of safe moves with luma bs, plus she has some nice juggles on us but we also have some options to get away from them and mix our landing, we also can edge guard her pretty decently
Shuriken are good plus you can short hop them, and throw them where it hits rosas head and not luma, just remember she can just spam down B. Just remember that if you have the lead and she keeps absorbing shuriken, let her do so by all means since she will have to stop and approach eventually.
Last thing on my head is that if she tries to trap you between her jab and lumas, you can roll behind her and punish her for it.
Personally think the MU is 50:50
-Hes combo food
-Its also an MU where you gotta know when to camp and when to go in
-You're better off killing him horizontally
-Don't be afraid to use gordos for dair, jump/run under them to punish DDD (that's if you can still punish him by the time you get to him depending on the distance)
-You can SSHC out of his jab
-Although shuriken is pretty good for gordos, bairs also do a pretty good job sending them back
-DDD also like to nair alot as previously mentioned, if you dont punish it on time, make sure to take note of what he does afterwards (they usually like to either dtilt or jab)
-Fighting at midrange isnt the best idea due to his hammers disjoint
-Edge guard him like crazy, since its your best bet to kill him since getting a read will most likely work at high percents where he feeds off rage
-When hes edge guarding you, pay close attention to the angle he shoots his gordos (he only has 3 angles), and wait for the right moment to either hit one back, or get back to the stage
-If he up Bs to the stage and tries to land on you, thats a free substitute
-Shadow sneak CAN get you of of jab, especially if hes not expecting it and tries to go for jab1. jab2, grab
I had the pleasure of playing Bryce who is an amazing DDD btw and was able to get this from our matches, I also like to mess around with DDD and have played the MU from both sides
Id say its an in between of 55:45 and 60:40 our favor
The MU needs to be played campy but also at a range that extends a bit more from midrange.