Kirby is one of Jiggly's better matchups since she's harder to edgeguard than most with Kirby. I'd say the matchup is about 50-50.
I can add some input on Jiggly's matchups.
Pika 40-60 Jiggly has a hard time approaching, but Pika can't edgeguard Jiggly to death as reliably
Kirby 50-50
Ness 50-50 Ness is one of the few characters that can combo Jiggly well. It's also extremely difficult to approach Ness when he's uair spamming. However, Jiggly has a much better edge game and can reliably combo Ness.
Fox 30-70 Jiggly can combo Fox to death, but forget approaching past those lasers, quick movement, and high-priority aerials. Your best bet is nair and platform camping.
Falcon 60-40 Falcon has a hard time both comboing Jiggs and fighting her off the edge.
Mario 30-70 Many of Jiggly's combos don't work here, while Mario can still uair combo.
DK 40-60 Too much priority, too little hitstun
Yoshi 60-40 You'll have an easy time edgeguarding and not getting combo'd, while you can combo easily yourself.
Luigi 20-80 I hate fighting Luigis. He has a crappy approach, but it doesn't matter since Jiggly's is worse. And he can combo Jiggly extremely easily while most of Jiggly's staple combos are ineffective.
Link 50-50 On Hyrule, I'd say it's slightly in Link's favor. Main strategy: get Link off the edge. Good luck getting past those projectiles and that huge sword. You can combo Link, but he can kill easily.
Samus 40-60 Jiggly can't combo or approach.
Maybe move 5 points against Jiggly's favor when you're playing on Hyrule. Tornado kills at 60-70%? Seriously? And don't bother taking Jiggly to Isai's house. Just stay at the middle platforms or the left edge.
Verdict: Overall, Jiggly has terrible matchups, but she does better than most against some of the top characters (Pika, Kirby, Ness, Falcon).
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Any drill on a character's shield is a grab unless you are really slow, an up-tilt on a shield is a grab, a dumb approach will get smacked by jiggly's up-tilt and then lead to a grab
Jiggly has a super good roll
I think Falcon vs Jiggly is too close to say who is betterA grab is death to Falcon but Falcon has his ways, a simple combo would usually be enough
Luigi vs Jiggly is not 20-80, if you have trouble comboing past a few up-airs, try doing weak f-air, reverse pound, or weak n-air to rest. I think n-air beats a lot of Luigi's approaches too. Luigi's approach is mostly rather low priority and awkward compared to jiggly's. but A mistake from Jiggly can lead to an easy loss of stock. I'd say more like 40-60 in Luigi's favor
Whether or not you are in the very middle of hyrule, rests are very useful at even 50-65 % range, for many characters they set up easy edgeguards too
I don't think any of DK's aerials beat Jiggly's n-air head on, DK's only real priority moves are giant punch, up-b and his absurd grab range. DK is very easy to combo with Jigglypuff and is the easiest character to follow when he DI's your down-air drill simply because he is so big and fat
I personally think you overrate Ness's combo ability on Jigglypuff also. There's the shield break combo but no real 0 to death except for the aerial spam to stomp near the edge but that's against every character. Jigglypuff has great, easy combos on ness and Jiggly's jumps let her edgeguard Ness really easily too. 60-40 in Jiggly's favor
Mario's up-air combos aren't effective enough to cause death (most of the time), Jiggly though still has her combos on him if you do more stuff than simply up-air. I'm not sure who beats who really but it's not as bad as 30-70 in mario's favor
Link vs Jiggly: not that bad, Jiggly can jab link's boomerangs for like 4 frames of clash and
no damage, dodge bombs fairly easily and is easy to up-air ***** to rest due to his weight. Smart links will never be dumb enough to aggressively fight near the edge and will instead try to draw the fight towards the middle of Hyrule. 50-50 on Hyrule
Samus vs Jiggly: Definitely Jiggly's favor, i'm tired so i'm going to simply say that isai said so
People nowadays seem to highly underrate Jiggly's drill as a common method of attack. People say you can DI away from it but really smart people can just follow your DI and follow it up often. Jiggly's aerial manuerability allows this to happen. If you want to you can not l-cancel if the opponent is fairly high percent so that they pop up from the ground for you to smack them or sleep on them
You can sort of follow their DI with repeated up-tilt but some people are capable of seizure DI that outspeeds Jiggly's tiny walk
I really don't think Jigglypuff's matchups suck except for against Fox, now that one you have to platform camp your way to victory. Jiggly is really a pretty good character, it's just that a lot of people just don't play jigglypuff to her full or even 70% of her potential. What should be an easy 0 to death each time Jigglypuff grabs, 90% of players still miss a lot of them to this day
