You guys are ridiculous. Isaac has no chance. If there are three most likely candidates right now, they are Pink Gold Peach, Toon Dark Pit, and Son Goku.
Kid Icarus and Mario have a stunning lack of representation as it is, and franchises like DK and Golden Sun got way too much attention in this game. Its so lopsided and biased its ridiculous. Plus, our third party reps are laughable and make no sense whatsoever in this game. Pac-Man? Sonic? Come on, now. Son Goku is the best choice, especially considering he actually got his start in video games.
Honestly, people voting for Isaac should just give up. Nobody liked Golden Sun anyway, and it was a poorly received RPG that pales in comparison to classics like Quest 64. And Isaac, as a general character, is a loudmouth that never shuts up in-game, and I suspect he will be equally annoying in Smash as well. He doesn't even use a sword either, and that's definitely something that our current roster lacks. There is no way he could ever be a unique fighter.
Face it everyone, Pink Gold Peach and Toon Dark Pit, are more unique, popular, well-known and important to Nintendo's history than Isaac could ever be. And Goku just makes way more sense.
TL;DR Oh ho! Tis funny because it is opposite of truth!
Don't report me, this is a joke, flame shield is up just in case. Isaac for DLC.