Palutena is actually a bag of good moves (all her aerials, Dash Attack, Jab mainly) that don't function in tandem. She has invinciblity there, huge damage here, good poke there. But overall it's kind of bleh. Not worst character but still not good.
Ganondorf is a bundle of amazing moves barring Jab, grab, and Utilt. It's just on a horrendous character, which is why he sucks so hard. Falcon's moves except far slower and lacking the knot that ties Falcon together (mobility) does not a good character make. Not to mention he gets bodied by pretty much every good character for many reasons.
Zelda is legitimately the most dysfunctional character in the whole game and I cannot understand why people don't see it. She has like... a handful of good moves (Utilt, Dtilt, Dsmash, Up-B) compounded onto a zoner who can't zone. An approaching Zelda is common sight and it's bad. Her options in the neutral are so limited against the top echelon of characters that she basically doesn't have one. Her advantage is... ok. She can kill with reads. She has quite a few combos. And her disadvantage state is... pretty bad. No reliable landing options on top of being hilariously easy to juggle/kill? Yea ok, see ya. Her recovery is fairly great, though.
If these characters were to be changed:
Palutena: Jab buffs, vanilla specials buffed barring Warp, other than that IDK
Ganondorf: Kill throw, 50/50 setups off a throw. Slight mobility buff? Like very slight.
Zelda: Din's no longer causes freefall in the air; Phantom charge can be held; Jab speed increased; Fair/Bair buffs
There's stuff I'm missing but as far as basics go this should work.