Weight

Weight is a measure of how far a character can be knocked back horizontally by an attack, if damage is held constant. It affects the vertical knockback also, in concert with falling speed. Remember, with the exception of Mario and Dr. Mario, no two characters are the same weight.

It is usually considered an advantage for a character to be heavy; however, extra weight can make characters slightly more susceptible to combos.

SSB Weight ranking
This is the ranking of characters in the first installment. It is listed from heaviest to lightest.

Very Heavy

 * 1) Donkey Kong

Heavy

 * 1) Samus
 * 2) Link
 * 3) Captain Falcon

Medium

 * 1) Yoshi
 * 2) Mario
 * 3) Luigi

Light

 * 1) Fox
 * 2) Ness

Very Light

 * 1) Kirby
 * 2) Pikachu
 * 3) Jigglypuff

SSBM Weight ranking
Following are the characters in Super Smash Bros. Melee, ranked in order of heaviest to lightest.

Very Heavy

 * 1) Bowser
 * 2) Donkey Kong
 * 3) Ganondorf

Heavy

 * 1) Samus
 * 2) Link
 * 3) Captain Falcon

Medium

 * 1) Yoshi
 * 2) Mario, Dr. Mario
 * 3) Luigi
 * 4) Mewtwo
 * 5) Roy
 * 6) Marth

Light

 * 1) Fox
 * 2) Falco
 * 3) Ice Climbers
 * 4) Young Link
 * 5) Ness
 * 6) Sheik
 * 7) Zelda
 * 8) Peach

Very Light

 * 1) Kirby
 * 2) Pikachu
 * 3) Mr. Game & Watch
 * 4) Jigglypuff
 * 5) Pichu

SSBB Weight Ranking
Here is the order of characters' weights in Brawl.

Super Heavyweight

 * 1) Bowser
 * 2) Donkey Kong
 * 3) King Dedede
 * 4) Charizard
 * 5) Ganondorf

Heavyweight

 * 1) R.O.B.
 * 2) Wario
 * 3) Samus
 * 4) Snake
 * 5) Link
 * 6) Ike
 * 7) Captain Falcon
 * 8) Wolf

Middleweight

 * 1) Yoshi
 * 2) Ivysaur
 * 3) Mario
 * 4) Luigi
 * 5) Lucario
 * 6) Marth
 * 7) Sonic

Lightweight

 * 1) Fox
 * 2) Falco
 * 3) Diddy Kong
 * 4) Pit
 * 5) Toon Link
 * 6) Ice Climbers
 * 7) Meta Knight
 * 8) Ness
 * 9) Lucas
 * 10) Sheik
 * 11) Zelda
 * 12) Peach

Featherweight

 * 1) Zero Suit Samus
 * 2) Captain Olimar
 * 3) Kirby
 * 4) Squirtle
 * 5) Pikachu
 * 6) Mr. Game & Watch
 * 7) Jigglypuff