[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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Yoshi is my consistent favorite. Because he belongs to the best weight class, light heavyweight, meaning he doesn't hurt for firepower and he's also tough to knock out, but he's no slowpoke. All of his basic moves are extremely strong: running + A, all C-stick/smash moves, crouch + A, regular A. His B moves are not the best, but they're not the worst either. And if there's a bad matchup for him, I haven't seen it.