Lightweights-

                                        
        Yoshi                               Toad                                 Peach
 

Pros

• The lightweights accelerate well nd can get a good position of the starting line
• They are the fastest of the three groups

• When turning corners without sliding, they lose much of their speed.
• When they crash into heavyweights, they will usually be thrown around.

Middleweights-

                        
           Mario                                    Luigi
 

The middleweights don't have any major pros or cons.
 

Heavyweights-

                                           
  Donkey Kong                           Wario                             Bowser
 

Pros

• When turning corners, even when not sliding, they won't lose much speed.
• When they make contact with another Kart, they usually won't be thrown out.

• They do not accelerate very well. It takes them long time before reaching their max speed.
• Because of their weight, when they drive on sand or grass, their tires will sink in, rapidly reducing their speed.