Agi
Smash Lord
I swear next time I find one of these we'll have figured out what's wrong with the capture card.
This may or may not already be known, as it seems to be a subset of ledge canceling, but any character's capable of immediately canceling their FAir into teeter while standing on the ledge, following up with any grounded option. How PRACTICAL this is is up in the air, but it has some pretty great coverage with Bowser here.