ok so now i'll go though and adjust gw's chart for large advantages
bowser - lacking range or any sort of approach on gw. large target and has very gimpable recovery.
cpt falcon - again lacks range to compete, speed isn't useful enough to pose any sort of threat, bad recovery
diddy kong - no range and is very light thus dies quickly. diddy doesn't have an upward killing attack to kill gw very early at all. recovery is very gimpable.
ganon - very strong character, but huge lack of speed and range make for an easy matchup.
jigglypuff - dies at around 60 percent to the downsmash, very light character. She's good for her ranged approach vs most characters, but the turtle covers too much area for it to handle.
kirby - he can edgeguard gw a little bit, but no range or vertical kill moves to compete.
lucario - no range, bucketable projectile, can't kill vertically. Easy to edgeguard, will rarely get to high percents to compete.
mario - no range, bucketable projectile, pretty easy to kill.
ness - incredibly easy edgeguard to gimp, bucketable approaches, also has no range, no vertical kill power.
peach - upsmash is too hard to land, projectiles don't cover much area at all to worry about, she can't edgeguard gw at all.
pit - very easy edgeguard to gimp, no upward killing moves that can't be di'd out of, arrows are bucketable, gw has more speed and range in almost every case.
sonic - dtilt will cancel all of sonic's approaches, upsmash isn't strong enough to worry about, has no range or kill potential.
squirtle - no range, very light, quick character but can't compete with gw's obscene range.
wario - no range to approach with, easy to edgeguard.
yoshi - obvious, character has no range, no grab speed, no kill moves that compete at all.
zelda - buckets zeldas approach (instant ko if unleashed), di'able smashes, toes are really the only competition but are quite easy to avoid, also very easy to edgeguard.
alot of these characters lose big time to gw for the same reasons: they don't have any range, don't have enough upwards killing potential, can't edgeguard him, or are easily edgeguarded by gw.
im debating the following characters for big check
fox - doesn't have any range or projectile game, but upsmash is quick and punishing
pikachu - gw can bucket alot, but a solid upsmash and the thunder isn't always avoidable/bucketable.
robot - this is probably robot's toughest matchup, but im not sure if its a big check. i can elaborate more if others agree
please, i would like some questions/debates if people think these are wrong, i'd be glad to elaborate.