Nice post Gonzo. Though I'm pretty sure Hanenbow is banned around here. I'll look at my neutral/counterpick list and give my opinion on a few of the more popular characters.
For the tourney I'm going to next week:
NEUTRAL STAGES:
- Final Destination, Battlefield, Smashville, Delfino Plaza, Yoshi's Island (B), Pokemon Stadium (M), Halberd, Lylat Cruise, Castle Siege
BANNED STAGES:
- Port Town Aero Drive, Summit, Mario Bros., 75m, Rumble Falls, Bridge of Eldin, New Pork City, Mushroomy Kingdom, Spear Pillar, WarioWare, Hanenbow, Shadow Moses, Flat Zone 2, Onett, Hyrule Temple, Big Blue.
COUNTER-PICK STAGES:
- Anything else not mentioned in Banned.
Nine freaking neutrals. o.O
Anyway: some of the more popular/difficult matchups for Kirby:
Snake: His down B mine gives me a lot of trouble on stages with platforms. Smashville is one that comes to mind. It's easy to forget about the mine, and get pwned when the platform is above you. Final Destination is one of my choices, sure he can camp, but his grenades are easy to catch, and you can get his power and camp back. Rainbow Cruise is good, as everyone else has already said, though I rarely think of picking it (I usually play wifi friendlies) I'll have to give it a try. Castle Siege looks like an interesting choice too, or maybe Green Greens.
Meta Knight: I haven't seen anyone else say this, but I think Pirate Ship could be a good counterpick. I dunno if it's banned where you are...but one reason it's good is because he can't stage-spike you due to the water. Some other reasons I can think of...the catapult thing can make things interesting, you could get lucky and he'll get hit by bombs...the shape of the stage allows your rock to slide around sometimes, though he can still chase and punish missed rocks if he's smart. I dunno who would have the advantage while you're falling in slow motion after the ship gets tossed up, but probably him, because he's Meta Knight -_-
What else? When the ship gets grounded, you can possible jablock him against the front of the ship. And when high tide comes in, you might get lucky and he'll get spiked by the ship. Also, when he's in the water, you can down B pretty easily.
Also, Norfair may or may not be a good idea :D
Lame and Watch: I don't really know here. Like Gonzo said, Halberd could be good. Green Greens is a good one too, in my opinion. I also kinda like Pictochat.
Donkey Kong: Rainbow Cruise...Lylat Cruise...FD, Smashville, Battlefield, Jungle Japes...anywhere you can force him to fall off due to his bad vertical recovery. Same with Bowser.
Diddy Kong: All I can really think of is Lylat Cruise...maybe Green Greens or Pictochat again.
Rob: Luigi's mansion definitely. He can't fly under the stage, you can uptilt lock him, the pillars block his gyro projectile, you can camp back with "Beeep!". You can hammer him pretty easily when he's trying to get back on stage.
Lucario: This one's going to be important to me, since I might be playing the best Lucario in the midwest again. Rainbow Cruise you say? Sounds great! Makes it hard for him to camp, hard to recover, and jablock. Cool.
Dedede: uhhh...Dedede is crap. I'll just make sure not to EPIC FAIL a Kirbycide on Yoshi's story this time, and end up losing because he pops out and I die at the last second. That was a stupid move. He's a pizza cake though, I don't really care what stage I choose against him. Luigi's Mansion maybe, but Final Destination just sounds like a good place to pwn his face. >:E
PIKACHU: HALP! Anther is going to be at this tournament. The first time I faced him (in a friendly) I had no idea how good he was, but he won the last tourney. I definitely need advice on this one. His Nair is deadly, I learned that last time. I'll make sure not to pick a stage that he can easily ko with it, or stagespike with it. Green Greens? Jungle Japes? Advice would be great.
This is just my personal opinion on some stages:
I like Pictochat and Yoshi's Story for some reason. Probably just the atmosphere. Same with FD.
I HATE Frigate Orpheon. Not only is that place just lame, but I've gimped myself by using Final Cutter, and then the stage flips over immediately after, and I free fall (blinking) to my death. SO LAME. I realize that characters with worse recoveries can have a lot of trouble here, but I just hate fighting here.
Pokemon Stadium
2 sucks for Kirby, imo. None of the stage changes seem to give any advantage at all. The wind thing kinda helps Kirby I guess, but not really. It's not like he needs help staying in the air to perform aerials anyway. Also, the electric change. Those treadmills. Try using final cutter near the end, and you free fall, though you catch the ledge. Try using final cutter, and then get pushed off by your opponent. Instant death. Free fall, blinking to your death. I just don't like this stage. PS1 is pretty good though.
I like Corneria, maybe just because I've been playing Sector Z since N64.