My thoughts on this:
-Akira Yuki: To be honest, he could have a chance, although I'm not sure how he would play out.
-Heihachi Mishima: If I remember correctly, this guy and Klonoa replaced Cless Albane as Namco reps when the roster was publicly viewable. He does still have a good chance.
-Jacky Bryant: If we do get a Virtua Fighter Rep, Akira would most likely take that spot.
-King K.Rool: I can see him getting in.
-Black Knight: Maybe?
-Chrom: I honestly see other Fire Emblem characters like Lucina, Robin, or Anna before Chrom.
-Dunban: Shulk or Fiora would make a good Xenoblade Chronicles rep, Dunban would probably be in there somewhere, like in Shulk's final smash.
-Gilgamesh: Not likely, but that's just me.
-Lloyd Irving: Maybe not, considering a Tales of rep was thought of before.
-Monster Hunter: Maybe?
-Takamaru: Has a chance.
-Viridi: Pit would need to get in first, and I doubt Viridi would get a playable appearence. Most likely, she could appear as a spectator or assist trophy.
-Zero: If we do get a Megaman X rep, it's either Zero or X.
-Inkling: I really would like to see this character get into Crusade, but that's up to the developers to decide.
-Isabelle: I can see her as a playable character or assist.
-K.K. Slider: Villager or Isabelle would work better.
-MegaMan.EXE: Not likely.
-Proto-Man: Not likely.
-MegaMan X: Same as Zero.
-Skull Kid: Maybe, with Hyrule Warriors Legends coming around.