Mellow Ezlo
Spoony Bard
Since you didn't specify which game, I will list my best characters from each one
Super Smash Bros.
Luigi
Jigglypuff
Pikachu
Link
Fox
Melee
Roy
Yoshi
Kirby
Samus
Ness
Brawl
Toon Link
Mr. Game & Watch
Pikachu
Snake
Bowser
Series in general
Yoshi
Luigi
Link
Pikachu
Bowser
Super Smash Bros.
Luigi
Jigglypuff
Pikachu
Link
Fox
Melee
Roy
Yoshi
Kirby
Samus
Ness
Brawl
Toon Link
Mr. Game & Watch
Pikachu
Snake
Bowser
Series in general
Yoshi
Luigi
Link
Pikachu
Bowser