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.

It is considered an advantage for a character to be heavy; however, extra weight can make characters slightly more susceptible to combos. A notable example in Melee is that characters with lower than 87 weight fall down when hit by Fox's shine, and thus are invulnerable to his shine combos.

Weight ranking
Following are the characters in Super Smash Bros. Melee, ranked in order of heaviest to lightest. Metal weights assume that you multiply by 3 in order to achive them. Super mushroom weights are 1.6 times the original weight of the character and poison mushroom weights are 5/8 of the original weight.

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

Super Heavy

 * Bowser
 * Donkey Kong
 * Dedede

Heavy

 * Samus
 * Charizard
 * Ganondorf
 * Snake

Medium-Heavy

 * Yoshi
 * Wario
 * Ike
 * Link
 * R.O.B.
 * Captain Falcon
 * Wolf

Medium

 * Mario
 * Lucario
 * Luigi
 * Ivysaur
 * Sonic

Medium-Light

 * Ice Climbers
 * Pit
 * Lucas
 * Diddy Kong
 * Peach
 * Toon Link
 * Ness

Light

 * Zelda
 * Olimar
 * Sheik
 * Marth

Super Light

 * Zero Suit Samus
 * Kirby
 * Pikachu
 * Meta Knight
 * Fox
 * Falco
 * Squirtle

Featherweight

 * Mr. Game & Watch
 * Jigglypuff