got big dodge buffs a few patches ago, and a nair landing lag buff before that. Also jab/f-smash buffs.
has received a steady stream of buffs, particularly to down b.
got some small knockback buffs in the first patch. Later he got his lock removed.
got some very small positive tweaks.
also got buffs here and there.
all got a mix of nerfs and buffs.
also got improvements to blaster, d-throw, and shine, alongside his jab nerf.
got a buff to d-throw, but nerfs to up-b, especially up-b 2.
got a few endlag nerfs in the first patch, but then eventually got a few buffs here and there.
also got a jab fix, even if it pales in comparison to his nerfs. He also got improvements to d-smash and usmash in the tourney mode patch.
also got a Raptor Boost buff.
was also nerfed in the first patch iirc, and then later got nerfs to bair and fair.
got nerfs to weight (!), throws, and smashes.
got nerfs to Smashes and hydrant HP (increased) in the first patch.
got a 0.5% nerf to u-tilt in the first patch. We all laughed because we all knew Mario was bottom 5.
got nerfs to PK Thunder spam and d-throw damage. However, he also got a down-b lag decrease and a dair hitbox size increase.
got nerfs to Paralyzer and Usmash startup, on top of her superior landing lag from air dodge being fixed.
got a throw nerf.
got a few nerfs in the first patch.
got a handful of small nerfs + PP fix. Then he later got buffs to fair, jab, and some specials.
has gotten a handful of very slight changes in both directions.
Final lists:
Buffed: (30)
Mixed: (12)
Nerfed: (10)
Unchanged: (4)
This isn't counting stuff that is obviously just bug fixes, nor global changes, including ramifications of system changes. (Vectoring, shield stun changes)
Now if you really want to have some fun, go check out the
Smashboards Rankings based on tourney results. Dedede and PAC-MAN aside (who were only nerfed in the first 3DS patch), there is a very tight correlation, as you'd expect any sane patches to have.