The top ten characters I want as DLC would be:
10. Inklings - I've thought they were perfect for smash since Splatoon was first announced.
09. Young Link - Preferably reworked with a mask gimmick, but I'd take him even as a clone.
08. Vaati - Who should play like a speedy Link, with magic blasts for specials, and Mewtwo's Up B.
07. Geno - I'd take Mallow too, but Geno has much more fan support.
06. Skull Kid - Last Zelda character on this list, honest.
05. Tails - In Brawl I'd have said "keep Smash Bros about Nintendo", but with the roster of this game...
04. Toad - Next to Bowser Jr Toad's always been my favorite Mario character.
03. Claus - I love everything about this character's personality and story. I want him in another game.
02. Paintbrush Bowser Jr. - Zero Suit Samus, Dr. Mario, Sheik, Girl-Marth, don't tell me it can't happen.
01. Nester - From Nintendo Power. And Nester's Funky Bowling, for those of you arguing that he isn't a game character.
(I'd also like Slippy, Harmoknight, Wart, Bomberman, Ninten, Conker, Squirtle, Crono, Mog the Moogle or Kefka, and the Hyrule Warriors version of Impa)
Sadly most of those don't have a strong chance. Possibly Young Link, or the Inklings maybe (and before anyone starts giving me unsubstantiated rumors from a former Nintendo employee... They're unsubstantiated rumors from a former Nintendo employee, they mean as much to me as random guesses from the cashier at Burger King), but these other guys will be lucky to get into the next Smash.
The characters I think the DLC will probably end up being:
-Wolf
-K. Rool
-Isaac
-Dixie
-Shantae (that hurt to type)
-Another damn Pokemon