well, let's see, my top 5 characters would be:
1: Yoshi. few character have as much variety of power moves as he does.. and his spike move (forward + A mid air) is utterly devistating.. medium down + A is a great stun move..
2: Luigi. the master of air juggling.. and it's so fun to roll dodge behind a slow character like Link or Ganondorf and hit them in the back with his flaming jump punch..
3: Falco. fast, strong, and a killer spike move.. has a great cobmo starter in medium down + A
4: Dr. Mario. most well balaced charcter in the game. very strong forward + A midair attack..
5: Peach. can be very dangerous in the hand of someone who know what they're doing.. smash down + A is very useful..
yeah, I play this game way too much.. 
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