So far these are the newcomers for Super Smash Bros. for Nintendo 3DS/Wii U. These pictures are their reveal shots from their respective trailers. This will be updated when a newcomer is revealed.
2/13: Added Little Mac
4/8: Added Greninja
6/10: Added Palutena and Pac-Man
6/15: Finally added Mii Fighter
7/23: Finally added Lucina and Robin
I don't own these pictures or characters, they belong to Nintendo (Villager, Wii Fit Trainer, Rosalina, Luma, Little Mac, Palutena, Miis, Lucina, Robin), Game Freak (Greninja), Capcom (Mega Man), and Bandai Namco (Pac-Man)