[u]For the Wii U[/u]
Fox is my main for 1 v 1 matches. Good speed though he lacks a good way to K.O people other than his up-smash and up-air.
Great at racking up damage, but his attacks and rolls are sometimes too short distance wise. Still a force to be reckoned with.
Bowser is my alternate (which is shocking since I use a fast then a slow character). If you've ever fought a good aggressive Bowser player........it's just terrifying. You can't get away from him!
[u]For Melee[/u]
All about Captain Falcon. All his air moves have knockback and he is crazy fast. I love spiking or landing that power knee over and over.
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Depends on the game. N64: Pikachu because his move set was impressively strong. Melee: Mewtwo because it was just so nice having him in my game that I was playing at the time. Brawl: Meta Knight because he's [i]aggressively[/i] op. 3DS/Wii U: Bowser from the many buffs he has received, such as increased speed and a [i]much[/i] improved design from Melee and Brawl.