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OK. I have tested it on all the characters. Im going to use a 1-5 star rating system to tell you who its easiest and hardest to do it on. *-pie **- easy ***-average ****-tricky *****- hard.
These ratings are based on how easy it is to perform each step of the combo on your opponent. For example dairing and footstooling snake is easy but getting him with a second dair after you hit him with the nair is a little bit tricky since he is skinny.
PLEASE NOTE *this is my personal opinion thus far and it may be subject to change and this is based solely on training mode cpu's*
Mario-***
Getting him with the first dair>footstool is easy enough, but its a bit tricky to get him with the second one when hes laying on the ground because hes small and skinny. SIDE NOTE- when I do manage to get him with the second dair,on occasion, he falls out of it halfway through.
DK-*
Hes fat, hes heavy, and he's easily hit with the second dair. It's pretty easy to combo him.
Link-***
I personally have trouble landing a second footstool on link. You could just replace it with an up-air though for a good 53%(assuming you dont use fart). Besides that, the first part of the combo is pretty straightforward.
Samus-*****
For some reason, samus is just giving me a hella hard time. Whenever I do the first fullhopped dair, she usually ends up at the same level as me(probably because shes tall and floaty) so I cant foot stool her. And when I DO manage to footstool her she isnt stunned for very long after the nair .Maybe fiction will have better luck. But for now, im keeping this as 5-star.
ZSS-****
Easier than samus because you can usually land the first footstool without much trouble. She is REALLY flat on the ground though. So you have to be right over her to get her with the second dair after the nair.
Kirby-***
Its surprisingly not too bad with kirby. He usually ends up under you after the first dair but you may have a bit of trouble getting him with the second one after the fair/nair.
Fox-*****
Its impossible to use this combo on him when hes at 0%. From what I can tell, this trick only works on fox from 12-17%, a 5% window. Darned fastfaller. If anyone has better luck with this, let me know.
pikachu_*****
It is hard as hell to get pika caught in the full hopped daired. For me he falls out about 90% of the time after the first 4 hits connect.
Marth-****
See ZSS.( I knew he was a girl)
Game and watch-***
Nothing particularly hard or easy about this one. Just do it right and it should work.
luigi-****
Hitting him with the 1st part(fullhopped dair to footstool) is tricky enough, but after you land the fair or nair he slides too far for you to land that second dair.
Diddy-***
Landing the dair,footstool and nair is simple but i cant seem to get him with another dair while hes lying down.EDIT: You can get him with the dair while hes bouncing from the nair. So instead, you can just wait till he stands up(the nair forces him to do so) and either grab or tackle him.
Zelda-***
Same as diddy except after she's laying on the ground (after you nair her) she doesnt get up automatically(maybe thats just the cpu being stupid) so you can just jab her to stand her up and grab or just f-smash her while she's on the floor.
Sheik-**
Similar to zelda in that its hard to dair her while shes laying down. She's easier to footstool though for some reason after the 1st dair.
Pit-**
pretty easy to get him with the footstool and the second dair.
Meta-knight**
Its surprisingly easy to use this on MK. He seems to always be in the right spot for the footstool and its easy to get him with a second dair.
Falco-**
Fairly easy to use AND you can still use it even if you mess up the first time.(meaning when he has anywhere from 1-16%).
squirtle-***
Easy enough to land the footstool and dair, a little tricky to get him off the ground with a second dair due to his small size.
ivysaur-**
Easy to land the combo and then chain a second one. Especially useful if you can get him off the stage and then edgehog afterwards.EDIT:managed to pull a 0-death on ivy. The combo was dair>footstool>nair>dair>up-air>full waft>up-air.
Charizard-*
Really easy to land on him. Dair>footstool>nair>dair>up-air for an easy 53%.(you maybe be able to get him with even another up-air after that for a whopping 69%)
Ike-**
His heavyness makes it easier to combo him. Same combo I mentioned on charizard can be done on him.
Snake-**
See ike.
Peach-***
Easy landing the footstool >dair>nair. Hard following up because she lays very flat on the ground.
Yoshi-***
Nothing particularly special about this matchup. Just do the combo right and it should work.
Ganondorf-*
Hes heavy and slow. VERY easy to chain the combo into wafts or uairs.
Ice climbers-?
This really depends on the skill of your opponent. You can only footstool one of them so your opponent will be able to hit you and interrupt the combo with his other IC if he is skilled enough. Otherwise, this separates them pretty well.
Dedede-*
Hes FAT, making it pretty easy to get this to work on him.
Wolf-**
Same as falco.
Lucario-***
Nothing out of the ordinary here.
Ness-**
Fairly easy to land. And you can jab him while hes laying on the floor, then grab release for a free f-smash.
Sonic-***
Straightforward enough...
Bowser-*
Another fat and heavy guy.
Wario-***
This one may be a bit complicated depending on if your opponent DI's or not. If he does, you will have to chase him in order to land the second dair.
Toon Link-***
He may be a little bit tricky because hes short, but you can still get him with the second dair easily while hes bouncing.
ROB-***
ROB stands up immediately unless your is at its weakest when it touches him.(Seems more sensitive to that then other chars IMO). If he DOES stand up, you can still get him with an f-smash. Otherwise, hes not too bad.
Captain Falcon-***
Another average tall 3-star...
Jigglypuff-****
Small and floaty. 50% of the time she will be too far above you for the footstool, so you will need to double jump in order to reach her. It will be even harder if your opponent DI's.
Lucas-***
See ness(minus the ability to grab release for free f-smash)
Side Notes:
1) I dunno if its just me, but full hop dairing the opponent from the back seems to set them up better for the footstool.
2) Doing a second full hop dair to footstool seems to only be possible on big heavy guys like bowser and DK.