i actually know a few people who are awesome at different characters i know people who are really good with pit,ike, sanke, and ROB (the robot dude with the death rays)
I personally am best with Mr. Game and Watch. his final small rules. with it i can usually kill everyone in the screen at least once.
i like almost all of the chars..... all of them exept peach. i ussually am good with anyone because i ussually go random but if i had to pick it would be 1.Lucario 2.Toon Link 3.Meta Knight 4.Wolf and last but not least 5.Zero Suit Samus