In my experience: Kirby does badly against characters with better range than him. He has no projectiles, really slow horizontal movement in the air, and no particularly good approach options, so he's pretty easy to keep at arms length. So characters like Marth, Bowser, Roy, ZSS, etc. do pretty well against him.
Ones with particularly powerful smashes do even better because of his weight. Jiggs has a better time approaching because she's got that pound attack and the best aerial mobility in the game. A good player will almost always be attacking from the air.
I think she's a little more vulnerable from below and above at mid range while in the air because her up air and down air aren't quite as good as the others, so anyone who attacks well from those angles is good. Falcon, Yoshi (can zone with eggs too), and ZSS (her up smash is really helpful too) are probably good against her.
Jigglypuff is the weakest in the game kirbys ok though.
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