lol DLC has become so important in the Smash Bros. community... Well, out of 3 characters, my picks would be these:
3. Gunman Clive, the 3DS eShop game popular platformer's protagonist with the same name can be a likely candidate. He doesn't look too outrageous looking for Smash standards, and would be projectile based. Although, they probably will need to make up some moves for him or he won't make it, but he's still a good choice.
2. Inklings, from Splatoon, a Wii U shooter, will probably make it in. Many people are voting for them, and the popularity for them is growing. This game is also very noticed by Nintendo, with their own Amiibo series, I won't be surprised (only hyped) to see these guys make it. Their diversity of equipment allows a big moveset, and their palette swaps can be different ink colors. Probably more voted than Roy.
1. Amaterasu, from Okami, a Japanese style drawing/fighting game. This game is simply amazing. If you don't know what it is, find out and buy it. It's for the Wii and Play Station. Amaterasu is a goddess, portrayed as a white wolf, who must seal this dragon and stuff... But just because I like the game isn't the only reason they should be added. When you're in a fight, you use a disk to attack foes, and a paint brush to do other stuff, stun, attack... They're owned by Capcom *hint hint, Megaman* which can be a way for her to get in. Amaterasu has already been in a Capcom fighting game, so the possibility for them joining in the battle again may not be far away.
Honorable mentions to Shantae, Shovel Knight, Spyro, Rayman, and Banjo and Kazooie!