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Shirma Akayaku
: I'm not sure about Robin, but I do have a pretty good idea on how Rosalina would fare against Captain Falcon...
Rosalina vs. Captain Falcon
Captain Falcon has been well-known for his high mobility and strong attacks. However, his attacks are slow in execution, and because he has no projectiles, none of his approaches are considered safe.
Rosalina could take advantage of Captain Falcon's flaws by sending the Luma at him. Also, most of Captain Falcon's attacks only deliver one strong hit, so Rosalina can simply block them, and then punish Captain Falcon afterwards.
Recovery-wise, Falcon Dive is very predictable, and since the Luma can't be grabbed, Rosalina can use it to safely edge-guard Captain Falcon.
Simply put, Rosalina could potentially give Captain Falcon a good deal of problems, simply for the fact that he can't approach safely, and for his slow attack speed.