Weight

Weight is a measure that determines how much resistance to knockback a character has. It mostly affects horizontal knockback, since falling speed is more important when calculating vertical knockback. Different weights are only truly present in Super Smash Flash 2 and are non-existent in Super Smash Flash, where all characters have the same "weight".

Overview
Weight is a concept that can be described as how difficult it is to send a character flying. Different weights present both advantages and disadvantages to each character. Heavier characters are harder to KO, but most are susceptible to horizontal combos and chain grabs; on the other hand, most lighter characters have the advantage of being less susceptible to combos at higher percents while being easier to KO. The weight multiplier for knockback is represented by the value 200/(100+W), where W is the weight of the character.

Differences from the Super Smash Bros. games
Weight in Super Smash Flash 2 does not share all of the effects that are present in the Super Smash Bros. games. The length of throwing animations isn't dependent on the weight of the opponent being thrown and chain grabs do not necessarily work the same way as they do in the main games. For instance, in Super Smash Flash 2, is vulnerable to certain chain grabs, like 's up throw. However, in Melee, he wasn't affected by it due to his weight.

Types of weight classes

 * Light: Easiest to KO and get sent off stage at lower percents. Most characters in this category have a small frame. Examples are:, and.
 * Medium-light: Middleground between light and medium characters. Examples include:, and.
 * Medium: They are neither easy nor hard to KO as their weight doesn't present neither clear advantages nor disadvantages. Characters who fit into this category are, and.
 * Medium-heavy: Middleground between medium and heavy characters. They can be easily comboed until medium percents, they're harder to KO then medium weights, but can die earlier then heavies. Notable examples include:, and.
 * Heavy: Hardest to KO and send off stage. Most have a large frame. Examples of these characters are:, and.

Trivia

 * Zero Suit Samus was originally a heavy-medium character in the early versions of demo v0.9b, but this was corrected later and she became a medium-light character.
 * However, Zero Suit Samus is still heaver than she is in the official Super Smash Bros. games. Her current weight in Super Smash Flash 2 is 85, while in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS and Wii U it's 81 and 80, respectively.
 * Kirby is heavier than Pikachu in Super Smash Flash 2, even though the latter is heavier in all the Super Smash Bros. games except in Super Smash Bros. for Nintendo 3DS and Wii U, where they have the same weight.