Some thoughts I've been sitting on that I think would be nice to discuss:
-Luigi/Kirby/MK are probably the best counterpicks in the game when looking at effectiveness vs how easy they are to learn.
Luigi notably does decently/well against:
+Sheiks that don't camp
+Heavies
+Mario
+Fox
+Pikachu
+Diddy
Kirby against:
+Sheik
+Fox(trash matchup)
+Possibly Mario but would need a Kirby main to make sure
MK against:
+lol floaties
+ZSS
-Greninja's neutral is extremely underrated
-Ness sucks
-MKs existence and ease of use almost guarantees most floaties won't break into high tier and a lot of them will only get worsee
-"Just camp" is the answer to 80% of most people's MU issues vs characters like Mario and Heavies but most refuse to do it
-Bayo's dtilt bullets do a ridiculous amount of damage and have fair range, making it much harder to camp her with projectile characters than one would expect.
Kirby main here. The Mario MU, at least from my experience, is a -1 at worst. Being able to DI out of his D-Throw into U-Tilt combo string is a major plus if you ask me. As usual, Kirby has a pretty decent combo game at early to mid percents, U-Throw can reliably kill on stages like Smashville (Kirby's safest and best stage IMO), and getting the Copy Ability does help Kirby with spacing Mario than it does as a damage option. Mario can still cause problems, though, especially when it comes to edge guarding. Kirby's pretty easy to edge guard thanks to his slow air speed and predictability (the only good thing about Final Cutter is that it snaps onto the ledge). It also doesn't help that Kirby's really light, meaning that Mario doesn't need much rage to kill Kirby. Mario's debatable amongst Kirby players on whether or not he's only a -1 or -2, but I think it's a very doable MU, even if Kirby's not the best choice to go for when fighting Mario.
Also, I'd like to object to Kirby being easy to learn. He's not the most difficult character to understand and pick up, but Kirby works far better as a defensive (preferably bait and punish) than he does an aggressive character. I'm not sure how many of you guys have experience in the Kirby MU, but notice how some Kirby's won't really come to you. He has awful approach options, and the Kirby players know this. This is why Sheik needs to play this MU patiently if she wants to beat Kirby, because if she plays aggressively, Kirby's going to counter that. If you're talking about Kirby being a solo option, Kirby can't really work as a solo option. While he does pretty decently against characters like Fox and Sheik, characters like Rosalina, Sonic, Cloud, and Luigi can tear him apart really easily. Some Kirby players like myself are considering using Copy Abilities more, because while not all of them can turn the tide of a match the same way Charge Shot, Monado Arts, or Bonus Fruit can, a good chunk of the abilities do give Kirby an option in some way to help him out.
Kirby's a character that has a bigger future being a counterpick character than he does as a solo main. Kirby really does need someone to help him out. Personally, I think Mega Man is a really good pick considering that he can give characters like Sonic, Luigi, DK, Bowser, Cloud, and even Rosalina some amount of trouble, even if Bowser and Rosalina are even MUs. While Kirby is not an awful character, he does have a good number of shortcomings that keep him from making a significant impact in competitive play, though players like MikeKirby and Triple R have gotten some good results with him.
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