Each number represents ranking in comparison to the other characters--4 being highest, 1 being lowest. The numbers do not represent units of any kind.

Dustman (blue):

• Jump Height - 3
  
• Fall Speed - 3
  
• Light Attack Range - 3
  
• Heavy Attack Range - 2
  
• Attack Speed - 2

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• main character, maps are most likely to be based around him
  
• attacks are nearly identical to Dustgirl's, except for difference in range

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Dustgirl (red):

• Jump Height - 3
  
• Fall Speed - 3
  
• Light Attack Range - 2
  
• Heavy Attack Range - 3
  
• Attack Speed - 2

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• attacks are nearly identical to Dustman's, except for difference in range
  
• speed is identical to Dustman's
  
• speed is most noticeable during slope boosts
  
• slightly faster fall speed than the rest of the characters
  
• begins to fall faster after she reaches her jump peak

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Dustkid (purple):

• Jump Height - 2
  
• Fall Speed - 2
  
• Light Attack Range - 1
  
• Heavy Attack Range - 1
  
• Attack Speed - 4

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• has ability to triple jump
  
• triple jump allows for more air control and make long jumps

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Dustworth (green)

• Jump Height - 4
  
• Fall Speed - 2
  
• Light Attack Range - 4
  
• Heavy Attack Range - 4
  
• Attack Speed - 1

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• jump height makes Dustworth ideal for climbing quickly or finding shortcuts
  
• long attack range means Dustworth can spend more time away from dust surfaces

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Notes:

• Fall speed is identical to boost speed i.e. slope boosting and ground boosting. Therefore, Dustman and Dustgirl can often run faster than Dustkid and Dustworth
  
• Each attack has its own specific range and direction

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Various resources and other guides:
TheBirdOfPrey's character jump tests - http://youtu.be/gJ-j-XMIVFs
Ponifex's video on defining combo/super attacks - http://youtu.be/ffps8Fw8P-o

• Part 2 - http://youtu.be/yMuD6sWJM3w

Proof that supers do not vary with character

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Feel free to comment here if you have any questions or comments.

...or better yet, ask questions in the #dustforce IRC channel, people are always willing to help

if one link doesn't work, try the other
http://mibbit.com/#dustforce@irc.speedrunslive.com
http://mibbit.com/#dustforce@irc2.speedrunslive.com