Nerdy And Loving It

Here are the character stats for the Mario Kart Wii:

The +1, +2, and +3 means how much the stat is increased by (relatively speaking).
Lightweights
Baby Mario – Weight+3 Handling+2
Baby Luigi – Weight+3 Speed+2
Baby Peach – Speed+1 Weight+2 Acceleration+1 Handling+1
Baby Daisy – Speed+2 Weight+2 Mini-turbo+1
Toad – Acceleration+2 Drift+2
Toadette – Speed+1 Off-road+2
Koopa – Handling+1 Mini-turbo+2
Dry Bones – Acceleration+1 Drift+1 Mini-turbo+2
Mii – Speed+1 Weight+1 Drift+1 Mini-turbo+1
Middleweights
Mario – Weight+2 Acceleration+1 Handling+1 Drift+1
Luigi – Speed+1 Weight+2
Peach – Speed+1 Acceleration+2 Drift+2
Daisy – Speed+2 Handling+1 Mini-Turbo+1
Yoshi – Weight+1 Drift+1 Off-road+2
Birdo – Weight+1 Off-road+1 Mini-Turbo+2
Diddy Kong – Acceleration+1 Drift+1 Mini-Turbo+2
Bowser Jr. – Off-road+1 Mini-Turbo+1
Mii – Speed+1 Weight+1 Off-road+1 Mini-Turbo+1
Heavyweights:
Wario – Weight+1 Off-road+1 Mini-Turbo+2
Waluigi – Acceleration+2 Drift+2 Off-road+1
Donkey Kong – Weight+1 Acceleration+1 Handling+1 Mini-Turbo+1
Bowser – Speed+1 Weight+2 Drift+1
King Boo – Handling+2 Off-road+1
Rosalina – Speed+1 Handling+1 Mini-Turbo+1
Funky Kong – Speed+2 Off-road+1
Dry Bowser – Off-road+2 Mini-Turbo+2
Mii – Speed+1 Acceleration+1 Handling+1 Drift+1

Source: http://boards.gamefaqs.com/gfaqs/genmessage.php?board=942008&topic=42640178

Finally found some Kart stats on ign:

Source: http://guides.ign.com/guides/949580/page_19.html

Update:  Replaced picture.  It now links to a bigger size when you click on it.

Was looking up stuff about Mario Kart Wii, trying to find out how to unlock stuff and found out how to not get hit by a POW block. See the Youtube video below.

Just in case the video gets deleted in the future…you avoid the POW by jumping with the drift button right as the third pow hit is disappearing.