Louie G.
Smash Hero
I'm just thinking that Sakurai may want to get all the characters out before the reveal of the game.I highly doubt we're going to get a Newcomer reveal every month. In fact, I wouldn't be surprised if we only got like 0-2 before E3. That's where I expect we'll get another 3 like last year.
Since Luigi and Toon Link, obvious unlockables, have already been revealed.
I'd say Marth, but he's interchangeable.