What about Zelda or Palutena since they have warp recovery moves?
in the case of Zelda, if you know she can warp to the stage, I think it's probably best to shield and see if she goes for the hit or not. If she does then just shield drop to Fsmash, As far as palutena is concerned, it depends on how far inside the stage she can warp to, if she can only land on the very edge anyway, it's probably still worth it to time your Dair cause she lags quite a bit when she lands during warp so you would catch her anyway and cover two options.
Then of course in the case that either character can only teleport to the ledge then focus on spiking the ledge snap.
I can't wait to start using this on Pits and villagers, there have been a lot of times that i've gotten a dunk on pit or dark pit and they just up B back to the ledge; gonna be a lot of fun turning that into a second spike.
And villager probably doesn't need an explanation...