As a semi-dedicated Ness main throughout the Super Smash Bros. series (I've also mained Jigglypuff, Sonic, Snake, Lucario, Pac-Man, Mega Man, and Roy), I find this video to be rather inspiring.

Bowser, Ness, DK and Captain Falcon, what do all of these characters have in common? These are all low tier characters that were picked out of the blue by top players in high level tournament matches in an attempt to catch their opponent off guard. Sometimes it works, and sometimes it backfires horribly.