I believe this is the list, I didn't create any of it.
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Weight - measures how far characters get knocked HORIZONTALLY, or left and right. This list I tested from the Mushroom Kingdom 2 weight scale. Also someone helped me with this by RATING the weights (Mario = 100, a.k.a. average), which is shown on the far left side. I rechecked his work and fixed the mistakes in it, and here is the list.
--- 117 --- (1) Bowser
--- 114 --- (2) DK
--- 110 --- (3) Samus
--- 109 --- (4) Ganondorf
--- 108 --- (5) Yoshi
--- 104 --- (6-7) Captain Falcon / Link
--- 100 --- (8-10) Dr. Mario / Luigi / Mario
--- 94 --- (11) Ness
--- 90 --- (12-14) Peach / Sheik / Zelda
--- 88 --- (15) Ice Climbers
--- 87 --- (16) Marth
--- 85 --- (17-19) Mewtwo / Roy / Young Link
--- 80 --- (20-21) Falco / Pikachu
--- 75 --- (22) Fox
--- 70 --- (23) Kirby
--- 60 --- (24-25) Jigglypuff / Mr. Game & Watch
--- 55 --- (26) Pichu
Credits: Blake Mutschler and Aaron Kurtz (and me of course for fixing the mistakes they made and adding Misc. related data about it)