Some I am okay with. Some I despise. No profiles yet since they haven't been announced officially, but since they are confirmed I thought I'd share some brief thoughts on the characters discovered so far. Of course, for those of you who have seen the leak (as in everyone), these characters aren't really a surprise, per se.
Ganondorf - His inclusion is no shocker; I am, however, wondering if they have done anything to modify him and set him apart from Captain Falcon at all. It would be nice if they did... you know... since it doesn't make sense for the main villain of the Legend of Zelda series to be a clone of a fighter from an entirely different game....
Wario - Meh. I expected that he would make it back in, so no surprises here.
Dr. Mario - I don't know whether to laugh or cry. In Melee Dr. Mario was always my main fighter after Young Link, but at the same time, it's literally Mario wearing another set of clothes. Dr. Mario should just be a costume for Mario when it's all said and done; I don't understand why he isn't.
Falco - We have another Star Fox character! Woohoo! Unfortunately, it sounds like Wolf may have received the cut... Wolf was my favorite... disappointing.
Ness - Original 12 and Earthbound representation! That's about it. I never actually play as Ness.
Mr. Game & Watch - I thought he would be cut, in all honesty. I began to suspect otherwise when they announced Ike (which basically threw all of my expectations out the window), and in the end I'm happy that Mr. Game & Watch is back. I always like playing with him for a few rounds.
Dark Pit - And this is why I don't like Dr. Mario being in the game, because it sets a precedent that Dark Pit has followed. Seriously, why couldn't this be a palette swap of Pit? If there are going to be three Kid Icarus characters, I want one of them to be Eggplant Wizard!
Duck Hunt Dog - Why? Why is this in the game? If they were going to represent a classic game, this is not the one I would have chosen. I would have gone with Mike Jones from StarTropics. Who knows, maybe this will turn out to be a character I enjoy playing as. But right now I just wish it wasn't in the game. Stupid dog ruining everything.
E: Adding rest of characters now.
Jigglypuff - NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO I HATE JIGGLYPUFF WHY I DON'T CARE ABOUT ORIGINAL 12 ANYMORE
R.O.B. - I was seriously hoping that R.O.B. would be cut. Oh well.
Bowser Jr. - Aside from the fact that this game is waaaay over saturated with Mario characters now thanks to Dr. Mario and this guy, I'm also excited. Bowser Jr.'s play style seems unique, and he's also one of the very few characters to do costumes right.
And while we're on the subjects of clones and alt. versions of characters receiving their own character slots in the game, why couldn't Paper Mario be a fighter again??