In my opinion:
[Insert Name Here]: Bowser - [Insert Name Here]
Meta Knight: 35-65
Snake: 40-60
King Dedede: 10-90
Game & Watch: 30-70
Falco: 40-60
R.O.B.: 40-60
Marth: 35-65
Wario: 55-45
Lucario: 35-65
Donkey Kong: 25-75
Diddy Kong: 35-65
Pikachu: 40-60
Ice Climbers: 45-55
Kirby: 35-65
Pit: 50-50
Wolf: 50-50
Toon Link: 40-60
Olimar: 35-65
Fox: 50-50
Zelda: 45-55
Zero Suit Samus: 40-60
Luigi: 40-60
Peach: 60-40
Ike: 55-45
Sheik: 50-50
Lucas: 55-45 (Lucas is listed as Mid Tier on the chart)
Ness: 60-50
Mario: 50-50
Pokemon Trainer: 55-45 | Squirtle: 60-40 | Ivysaur: 45-55 | Charizard: 50-50
Samus: 30-70
Yoshi: 45-55
Sonic: 60-40
Jigglypuff: 65-35
Ganondorf: 65-35
Link: 60-40
Captain Falcon: 70-30
kinda kills the point of going weekly
anyway. I recently picked up bowser (along with luigi, so that i could have a trifecta that got utterly ***** by dedede). I started using bowser in a few tournament matches for the lulz, and heres what i found.
against metaknight, its a slight disadvantage for bowser, unless they're on FD, on FD you have the advantage, you can cg him quite well and combo it into kill moves. you are fat, which help a lot if you DI, since metaknights largely rely on dsmash for both making moves safe, and their kill move, so it will probably be diminished. fat + diminished kill moves means you will live for quite a long time.
on the tornado, SDI it straight up and you'll get out, preferably on the first hit since its much easier to do then
other than that its the basics of bowser, upb out of shield most of the attacks, downsmash instead if he messes up his spacing. i'm not sure if your fairs beat his, they seem to land a lot though.
mr. eh's pokemon example is actually pretty close to the mark, the only difference being that sword (and all other sharp objects) are effective against everything, real life included.
however, if you do know the matchup pretty well, you will likely be at an advantage because 99% of metaknights will have no ****ing clue on how to deal with bowsers. so next tournament you go to, find a metaknight, go to an open station, and practice the matchup for about 9-10 rounds, bowser does pretty well against metaknight, go for kills early and youll win against most of them. just pray they don't know the matchup.
45-55 on most stages 60-40 bowser on fd
for snake, it seems pretty even, but i don't have any tournament experience on it, so i'll leave that to you guys
but i can give you a few tricks that i learned using other characters that are kinda universal against snake
if he doesn't cook the grenade, run through it and grab him, no you'll take 4%, he'll take 7-12, and you'll both take 12% from the second grenade he shield dropped right before you grabbed him. bowser might actually do this better due to sideb.
any aerial grab (bowsers sideb included) eats snakes cypher, if you can land it on the cypher it's usually a kill.
he doesn't like you in mid range, so if you have any move that out ranges his ftilt/utilt (firebreath for you i guess) you can space him in that area
get him in the air, he's pretty easy to juggle
and... yeah, you got good enough oos options so i shouldn't have to go into punishing his tilts. have fun, its pretty close to even from what i've seen, snake might have a VERY slight advantage due to camp, but the infinite jump gives you enough mobility to get around that.