Things to note from ragna
-ID
-BS is + so if he manages to get you to block one, don't mash anything out
-Overall damage is slightly lower, but OD lifesteal can put a big difference between his opponent.
Pros
-can zone with sonic sabers and 623b
Cons
-ID can clash with phorizer and can follow up with another one.
Honestly i can't think of much because of how this match is really straightforward. Zone him, get stars, go in, watch for dps. It's really helpful that i don't think he has that good of a mix up and usually sticks to the ground.