Kirby's Star Shot (Neutral Special after Inhale), is a unique projectile in that the damage it can deal is based on how heavy the victim's weight is. By analyzing the damage each character does I've constructed a list of Weight Classes.
The list is organized from heaviest to lightest Weight Class, and then heaviest to lightest within the Class:
Very Heavy (18%)
Bowser (Koopa)
Donkey Kong
Dedede
Heavy (17%)
Samus
Charizard
Ganondorf
Snake
Medium-Heavy (16%)
Yoshi
Wario
Ike
Link
R.O.B.
Captain Falcon
Wolf
Medium (15%)
Mario
Lucario
Luigi
Ivysaur
Sonic
Medium-Light (14%)
Ice Climber
Pit
Lucas
Diddy Kong
Peach
Toon Link
Ness
Light-Weight (13%)
Zelda
Olimar
Sheik
Marth
Very Light-Weight (12%)
Zero Suit Samus
Kirby
Pikachu
Meta Knight
Fox
Falco
Squirtle
Feather-Weight (11% or less)
(11%) Mr. Game & Watch
( 9% ) Jigglypuff (Purin)
Edit:
To clarify, damage done to the victim who is Inhaled and shot out is 10%. The damage the Victim deals as a projectile is based on their weight. Heavier characters create heavier projectiles which deal more damage.
Update:
Characters rearranged within the Classes to reflect their specific weights.
The list is organized from heaviest to lightest Weight Class, and then heaviest to lightest within the Class:
Very Heavy (18%)
Bowser (Koopa)
Donkey Kong
Dedede
Heavy (17%)
Samus
Charizard
Ganondorf
Snake
Medium-Heavy (16%)
Yoshi
Wario
Ike
Link
R.O.B.
Captain Falcon
Wolf
Medium (15%)
Mario
Lucario
Luigi
Ivysaur
Sonic
Medium-Light (14%)
Ice Climber
Pit
Lucas
Diddy Kong
Peach
Toon Link
Ness
Light-Weight (13%)
Zelda
Olimar
Sheik
Marth
Very Light-Weight (12%)
Zero Suit Samus
Kirby
Pikachu
Meta Knight
Fox
Falco
Squirtle
Feather-Weight (11% or less)
(11%) Mr. Game & Watch
( 9% ) Jigglypuff (Purin)
Edit:
To clarify, damage done to the victim who is Inhaled and shot out is 10%. The damage the Victim deals as a projectile is based on their weight. Heavier characters create heavier projectiles which deal more damage.
Update:
Characters rearranged within the Classes to reflect their specific weights.