Tier List:

Top:
Sheik
Fox
Marth

Upper:
Peach
Falco
C. Falcon
Samus

High:
Jigglypuff
Dr. Mario
Ganondorf
Mario
Ice Climbers

Mid:
Luigi
Link
Roy
DK
Pikachu
Zelda

Low:
Ness
Young Link
Yoshi
Kirby
Mr. Game & Watch
Bowser

Bottom:
Mewtwo
Pichu

I use Marth first and Captain Falcon second. I used to use Roy before
I discovered how low tier he was. Then I switched to Marth. Wasn't the biggest jump in the world.