I'll put some input on Fox and Diddy:
Niether really have bad stages at all, its pretty much just MU dependent. I Contest the fact that dreamland is - fox, Even though laser camping is nerfed in PM he still outruns pretty much the entire cast and abuses the large space very well. Up-smash still kills fast in Pm because of the large numbers of floaties, even on dreamland. I wouldnt say he is advantageous on that stage for most of the cast like in melee, but I'm sure its not negative.
If fox had stages he wants to avoid it would be FD, Skyworld and Green Hill zone. They all have minimal platforms so he gets chaingrabed easily, and cant abuse his good platform movement. Skyworld Is large enough for him to circle camp people, but the open area in the middle sucks for fox imo. The over reaching ledges don't help Fox's recovery all that much, and give other characters more options that he can't neccesarily cover all at once with Shine stall>bair from ledge (most fexible fox edge guard). GHZ has a high ceiling but really short side blast zones, so his vertical kill power takes a hit while he still dies really early off the sides. Minimal platforms again get him chaingrabed and juggled.
Diddy likes all the stages as well, He doesn't mind large stages for camping and small stages for huge punishes. If I had to pick ones he expecially excells at I would put FD/Skyworld/Dreamland/Warioware /GHZ. He struggles on Smashville and Yoshi's island brawl in certain matchups, getting tech chases easily and the long platform "steals" bananas when the fall on top of it.
Sheik also LOVEs Smashville.
Making these lists are hard because Most stage choices are pretty much MU dependent, Like you don't want to let Ganon go to WW, Yoshi's, Metal Cavern, etc, and Ivy getting PS1 or any stage she can charge solar beams off of the stage itself.