WARNING. This may be inaccurate; I was "eyeballing" it the whole way. My method was to bounce off a spring and then double jump and to record the height gained (I obviously did every character several times to get a "feel" for it). The heights are in stage builder blocks. The characters with multiple jumps have more error. Some characters bend their bodies in odd ways so they're a bit hard to tell. I hate to preface research with all these notes about how it could be wrong, but I'm just a bit unsure about this. It's useful enough that I feel as though I need to post it anyway. I found some of these results pretty surprising.
Mario: 1.5
Luigi: 1.75
Peach: .5
Bowser: 1
Donkey Kong: 1.25
Diddy Kong: 1.75
Yoshi: 2.75
Wario: 1.25
Link: 1
Zelda: 1
Sheik: 2
Ganondorf: .75
Toon Link: 2
Samus: 1
Zero Suit Samus: 2
Pit (jump 2): 1
Pit: (jump 3): 1
Pit: (jump 4): 1
Ice Climbers: 1.5
R.O.B.: 1.75
Kirby (jump 2): 1
Kirby (jump 3): 1.25
Kirby (jump 4): 1
Kirby (jump 5): .5
Kirby (jump 6): .25
Meta Knight (jump 2): 1
Meta Knight (jump 3): 1
Meta Knight (jump 4): 1
Meta Knight (jump 5): .75
Meta Knight (jump 6): .5
Kirby and Meta Knight total about the same; they were VERY hard to tell how high each jump goes. Consider Meta Knight's .25 "advantage" in total rounding error.
King Dedede (jump 2): 1
King Dedede (jump 3): 1
King Dedede (jump 4): 1
King Dedede (jump 5): .5
Olimar: 1.5
Fox: 2
Falco: 1.5
Wolf: 1.25
Captain Falcon: 1.25
Pikachu: 1.75
Squirtle: 1.5
Ivysaur: 1.5
Charizard (jump 2): 1
Charizard (jump 3): 1
Lucario: 1.5
Jigglypuff (jump 2): 1.25
Jigglypuff (jump 3): 1.25
Jigglypuff (jump 4): 1
Jigglypuff (jump 5): 1
Jigglypuff (jump 6): .5
Again, this was REALLY hard to tell heights for single jumps, but Jigglypuff definitely gets more height than Kirby and Meta Knight.
Marth: 1.25
Ike: .75
Ness: 2.25
Lucas: 2.25
Mr. Game & Watch: 1.25
Snake: 1.5
Sonic: 1.5
Average jump height (single jumpers only): 1.492424...
Average jump height (total): 1.820513...
Mario: 1.5
Luigi: 1.75
Peach: .5
Bowser: 1
Donkey Kong: 1.25
Diddy Kong: 1.75
Yoshi: 2.75
Wario: 1.25
Link: 1
Zelda: 1
Sheik: 2
Ganondorf: .75
Toon Link: 2
Samus: 1
Zero Suit Samus: 2
Pit (jump 2): 1
Pit: (jump 3): 1
Pit: (jump 4): 1
Ice Climbers: 1.5
R.O.B.: 1.75
Kirby (jump 2): 1
Kirby (jump 3): 1.25
Kirby (jump 4): 1
Kirby (jump 5): .5
Kirby (jump 6): .25
Meta Knight (jump 2): 1
Meta Knight (jump 3): 1
Meta Knight (jump 4): 1
Meta Knight (jump 5): .75
Meta Knight (jump 6): .5
Kirby and Meta Knight total about the same; they were VERY hard to tell how high each jump goes. Consider Meta Knight's .25 "advantage" in total rounding error.
King Dedede (jump 2): 1
King Dedede (jump 3): 1
King Dedede (jump 4): 1
King Dedede (jump 5): .5
Olimar: 1.5
Fox: 2
Falco: 1.5
Wolf: 1.25
Captain Falcon: 1.25
Pikachu: 1.75
Squirtle: 1.5
Ivysaur: 1.5
Charizard (jump 2): 1
Charizard (jump 3): 1
Lucario: 1.5
Jigglypuff (jump 2): 1.25
Jigglypuff (jump 3): 1.25
Jigglypuff (jump 4): 1
Jigglypuff (jump 5): 1
Jigglypuff (jump 6): .5
Again, this was REALLY hard to tell heights for single jumps, but Jigglypuff definitely gets more height than Kirby and Meta Knight.
Marth: 1.25
Ike: .75
Ness: 2.25
Lucas: 2.25
Mr. Game & Watch: 1.25
Snake: 1.5
Sonic: 1.5
Average jump height (single jumpers only): 1.492424...
Average jump height (total): 1.820513...