Pac-Man 36th? Have you ever even seen Abadango? He has great KO Power, he's hard to kill and even attack, he has great projectiles, he has great recovery, and he has great results too, for people who like results (I son't use them myself, but others do soooooo). There's absoluty no excuse whatsoever to put him below top 18.
Otherwise, here are my thoughts:
If this is customs off, Mii Brawler is nowhere near where he is whatsoever. He's just awful without his Helicoptor Kick, simple enough.
Shulk's nowhere near 49th too, he has great range and his monados are really good, and he has great KO power. He can easily survive due to Shield, KO even easier with Smash, Rack damage easier with Buster, combo easily with Speed, and recover better with Jump.
King Dedede isn't the 4th worst, he has great comboing and KO Power, and can easily get damage. And he has good range. Frame data screws him over, but not THAT bad.
Captain Falcon has too many flaws to be up there, such as having a terrible recovery and having trouble KOing without using his forward smash or forward air, which you can only use at the right moment (You can use forward air, but the really good hit is hard to get.
Ryu I don't think is THAT good either, but I don't have him myself so I won't complain it.
Diddy isn't THAT good for reasons said above.
Meta Knight, Olimar, Villager, and Peach are all way better than the Pits, the Pits have trouble KOing or racking damage. Meta Knight should also be top tier, he has amazing combos, great dash attack, airs, and specials, no trouble koing at all, in fact it's easy for him to KO.
Falco shoudn't be THAT high in that tier, Fox does everything he does better apart from recovery, and ot can be a pain for him to combo, and he's slow.
Bowser and Game & Watch are nowhere near that spot. Bowser has terrible frame data, has slow speeds in everyone but running, bad approach, and doesn't have many combos. Game & Watch has trouble KOing without His down special (Which can both be hard to get one hit with, let alone all three, and most characters can't do anyhing to his bucket.)
Zelda shoudn't be that high, she sucks at everything but KO Power, Damageing, and recovery. TERRIBLY. And a ton of attacks suck extremely badly, like Samus, but less extreme.
Lucario has great matchups aganist really good top tiers like Sheik, and can KO VERY well at high percents, and live while at it, plus good damage racking with enough aura, a great projectile, pretty fast, and good or great, depending on how much aura, recovery.
Pretty good otherwise.