Each character has a few IC-Constants to determine what can and can't be done...

I believe an IC-Constant is basically like this:

• A number of a move's amount (ex. number of times a character can punch, jump, etc.)
• Whether a move can be performed (ex. the player can fly, the player can wall jump, the player can rapid-jab, etc.)
• How a move is performed (ex. final smash close range, final smash long range, etc.)
  

So in other words it's what makes a character play the way they do.

Here is a list: Click Here to View
Here is some more good info: click here to view

Hope that helps ya understand a lil' more.   I would also like more info on this. Anyone wanna help us out?