Here's a list of DLC characters that *I* wanna see as fighters in Smash Bros 3DS and Wii U.
Blaziken
Yes, he might be a Captain Falcon clone, and yes, he was a background character in the Kalos Pokémon League on the Wii U. BUT, Just imagine how he'd be as a playable character. THAT COULD BE AWESOME! Blaziken is by far my favorite 3rd Generation Final Evolution Starter, and it'd be a shame not to include him in the fighter roster in Smash Bros. I'd make his Specials, grabs, and down tilt similar to Captain Falcon's, and the other attacks like Fox. BUT, his final Smash can be, get this, his Mega Evolution! His Mega Evolution will be a transformation that powers up his speed, jump height, and his attack strength. I'd also have him talk in the voice of Phillip Bartlett. Also, as he fights in the Kalos Pokémon League, another Fire-Type Pokémon will take his watching spot. Like the idea now? If you do, good for you! If you don't, well, I wouldn't be a happy camper anymore.
Tabuu
Let's face it, Tabuu was by far a cool character in Brawl, AND STILL IS!! Yes, he was a goner in the end of the story of the Subspace Emissary, but you could also say that Master Hand met the same fate during the story of The Subspace Emissary, yet he's back and greater than ever in the 3DS and Wii U versions. Tabuu should follow suit. Tabuu will float like Mewtwo, yet be the exact size as Ganondorf. He'd also be the very first character to ACTUALLY represent the Smash Bros. franchise. Get it? From Smash, in Smash, for Smash! AND, get this, who would win in a fight? Tabuu, or Master Core? I'm betting my bottom dollar on Tabuu!
Wolf, Lucas, and Ice Climbers
I know they were cut from the game, but I really liked them in Brawl. For obvious reasons, the Ice Climbers where cut because of the 3DS' hardware limitations. Wolf and Lucas where also cut from the roster, sadly. BUT, if sakurai puts them in as DLC, as part of a pack, they could be back in the hall of fame! They will pretty function the same way they did in Brawl, and they're individual characters, so it's a win-win situation for DLC to put them in.