Fox: FoD, Battlefield, Yoshi's, Dream Land 64, Final Destination (tech-chasing,) Pokemon Stadium (ceiling)
Falco: Battlefield (consistency and recovery), FoD (Sheik stage), DL64 (recovery gains and easier to DI,) Yoshi's Story (Die a lot), Pokemon Stadium (platforms, long), FD (lasers)
Marth: Dream Land, Battlefield, Pokemon Stadium, Finald Destination, Yoshi's, FoD (I think Marth's better here than Yoshi's)
Peach: Pokemon Stadium, Yoshi's Story, Battlefield, Dream Land, FoD (agree with Laudandus on camping on DL, but disagree that you need very much room, so I think it ends up worse). IDK where to put FD
Jiggs: Not enough experience, I usually go YL, but I like Yoshi's quite a bit
IC's: Yoshi's, Battlefield, Dream Land, Young Link (Yoshi's is like, perfect, for needle camping strategy. Battlefield is better than FoD because it's way harder for IC's to shark top platform on Battlefield and FoD is becoming an IC's stage)
Falcon: FoD, Battlefield, Yoshi's, Dream Land, Pokemon Stadium, Final Destination (I prefer the longevity on Battlefield to the small quarters, and Falcon can do some wonky stuff on Yoshi's. Some Falcons actually like it.)
Samus: Go Pokemon Stadium or Yoshi's, ban FoD
Luigi: Doesn't matter much, just don't screw up.
Doc [& Mario]: Doesn't matter much, just don't screw up. Ban Final Destination (Chain-grabs)
Pikachu: Doesn't matter much, just don't screw up. Go Final Destination if you know they'll stay Pikachu.
Ganondorf: Ban Yoshi's Story, avoid FoD. Counterpick whatever. Don't let anything get into your head and you'll beat Ganon on basically any stage