I dislike light shielding vs Puff because the main boon of fighting vs Puff's wall of nonsense (assuming she's pressuring, which I'm guessing she is because there's no reason to shield otherwise) is that the gaps between her hits give you a chance to action out safely (pretty much always - you may not get a direct counterattack, but you can always jump, WD, etc. between bairs and such). Lightshield's increased stun time reduces your ability to do this. I also think there's a chance it opens up opportunities for bullcrap frame traps because lightshielding often does that with specific links but... I don't know what they are with Puff specifically.
edit:
Okay, so Roy's shield sucks and he can't do something the characters with good shields can do (as automatically). Oh well. Life goes on. Roy's not exactly a huge relevant point of contention for strategy anyway since nobody uses him, he sucks, etc.
Atm I still think Peach loses to Puff. Armada doesn't use all of peach's potential yet though and he is just straight up awful against puff with every character (relative to his normal skill ofc)
I think doing stuff like dj landing after shielding bairs, option selecting the tomahawks, jc ac fair for movement and platform camping (peach is way faster vertically for once LOL)
There is only one peach that really complains about the matchup and there is no "recent" footage of it (last was apex2010... 2 years ago)
Okay. I'm gonna ignore the first bit on character johns.
DJL has potential, yes. If Peach ever develops a better platform game this will be how she's gonna do it (plus shield drop > bair). And yeah, if you can do it well (which isn't terribly hard - just slide X > Y or vice versa) then it's much faster than WD down OOS. So, yay. Minor speed buff to Peach's OOS game. But I don't think she can still punish anything after DJLing because of her slow dash. Maybe I'm underestimating it? But I don't see how there could be enough time for it. If Puff does a really aggressive play then perhaps. I think DJL OOS > down smash or something might have some interested applications vs Puffs that crouch when Peach is shielding (it's not bad, actually; crouch beats shield grab, SH & FJ nair OOS, turnips fly over... it only really loses to float nair OOS and that can be punished with a predict - it's not hard to cover that option either because it's the only real threatening counterattack in that instance). I think it covers some weaknesses, but I don't think it addresses anything major. Maybe I'm overlooking something though.
Regarding option-selecting the tomahawks... I haven't read the post on how it works. If we're talking about different things, chalk it up to laziness. Uhh, I think option-selecting the tomahawks with moves is also pretty good (I've grabbed my share of Puffs out of the air) but Puff having more grab range than Peach still gives her the advantage her, IMO. She doesn't have to commit as much... and I feel that Puff's aerial mobility gives her too much ability to play baiting games and... Puff potentially gets a massive reward for getting something correct. Peach? 10-14%. I do think this kind of thing improves her game vs empty jump but... again, I don't think this addresses what really hurts Peach in the MU.
I'm not sure how Peach has to be developed to win this one (or have a good shot) but I think it'll revolve mostly around getting good angles to attack Puff from. I think DJL onto platform is fast and opens up some interesting ways of doing the turnip approach.
However, in a different direction, I think DoH is onto something (or at least has an interesting and logical angle) with his suggestion to use the ground more. But I don't agree with some of his strategic stuff (I think f-smash's leanback should essentially be irrelevant vs a character who can aim at your face with such ease [stupid godlike aerial mobility & low gravity] since Peach only really leans her torso back a significant amount AFAIK). But then again, I'm not the Peach main. So maybe I'm missing something about the move. I think, hilariously, this is an instance where swinging down > up works against Peach because it adds "startup" to the move.
I wish Dair actually like, worked against Puff. Once you've gotten "in" on Puff with Peach, it occupies a potentially really annoying space for Puff and you can troll people that don't know how to fight it (and procure 2-step combos). But it's so DIable (and I'm pretty sure you can Rest Peach out of it with some kind of SDI wizardry) that it doesn't work vs people that fight it routinely at all. Which demotes it to "gimmick". Lame.
:/