Back when I played Smash 64, favorite to play as was Link. Then in Melee it was a tie between Marth and Roy, and in Brawl it was definitely Ike. I haven't played the Wii U/3DS Smash, but it'd probably be either Ike, Marth, Roy, or maybe one of the new guys with swords... I like swords, okay? XD
In terms of character looks though, I definitely do love Wolf, Fox, Falco, Bowser, and pretty much anyone who's non-Human. Not big surprise, and I imagine most people here on the Furry Forums will say similar stuff. :P