My characters I usually use are Toon Link, Ganondorf, Zelda, and Wolf.
TOON LINK
My favourite character. I just love abusing that up-B attack. His bomb and arrow are rather useful, and his Boomerang is so cool :S His Air Down-A attack is fun, but I rarely use it, because I spend so much time whirling around.
GANONDORF
I'll inflict 32% here, another 32% there... oh, yeah, that's great. Powerful, but slow, Ganondorf is made to strike hard. Hit, but make sure you don't get hit before. A strategy I like to use with him is to get them on the ground, then use my B attack to send them flying!
ZELDA
Can you tell that I like the Legends of Zelda characters? Anyway, Din's Fire is very good, I use it quite a bit. I love to spam it. Her Up-B is so good, I rarely die with her. Shiek's not so great though.
WOLF
I love that laser of his! I like the fact that you can use it up close to inflict more % then any other gun. The only thing I don't like is his Side-B, because too often I die from it.
I'm sort of a noob at this, so... yeah.