I don't own the game yet, but when I do I plan on trying/mastering:
Wario: There's very little love for this guy. Its always an FE pretty boy, a space animal or a character on speed. So as a big f*ck you to the SSB elitists I plan on using him. Plus, I love Wario.
Lucario: Like I said in my thread about Lucario I enjoyed him in the movie and convinced me that he would make a cool fighter.
Ganondorf: Ironically, despite my anger of him being a clone he was my main in Melee. I heard he was slightly changed in Brawl, so I want to find out for myself.
Kirby: Heard he's actually useful in Brawl, so I plan on going back to my first main character.
Yoshi: Ditto
Pokemon Trainer: Because I think the original starter Pokemon > every other starter Pokemon.
This might change, though, as I play with the other characters.