These are in no particular order in the tiers.
TOP
Marth
Wolf
MetaKnight
Diddy
Pit
Toon Link
Olimar
G&W
HIGH
Fox
Squirtle
Snake
Sonic
Dedede
Luigi
Shiek
Peach
Falco
MIDDLE
IC's
Zelda
ZS Samus
Lucas
Ike
Warrio
Mario
Kirby
Captain Falcon
Pikachu
ROB
Venusaur
LOW
Lucario
DK
Gannon
Bowser
Jiggily
Link
Ness
BOTTOM
Yoshi
Chrizard
Well, first thing's first. Its "Ivysaur", not Venusaur.
Second, I agree that Peach should not be High Tier
Third, Fox and Falco do not deserve to be knocked off, they are still worthy of top tier.
Fourth, MK is High-Middle, at best, he has no KO potential
Fifth, Lucario is also High-Middle, you obviously don't play him very much.
Sixth, Charizard does not deserve bottom, where DK does
Seventh, Sonic should be lower for the same reason MK does
Eighth, ZSS and Zelda probably deserve bottom of high tier, since Zelda is improved and ZSS is a good balance of speed and power(Side-B is devestating when hit correctly)
Wow, that was more than I meant to find, sorry for destroying your list
P.S. Not really sure why Diddy deserves to be top tier, but I don't play as him or against him that much, so I'm not really qualified to say. The same reason I don't post my own list, I don't play as or against enough people to make a list worth anything to anyone. But I do play enough to spot errors with the characters I do see.