Likelihood: 10% - This is me being generous. Lucina is a secondary character in Awakening, completely overshadowed by Chrom, the only character worth discussing chances-wise from FE13. She's such a total Marth clone that even in the game she features in, one of her two primary character traits (the other being major spoilers) is simply pretending to be Marth for about half the game. At absolute best, she'll be a trophy, maybe an Assist Trophy, or an Alt Costume for Marth. And even then, it's more likely, IMO, that Marth will simply take on the disguise she uses instead of having the character herself as an alt. The only reason we're even discussing her at this point is because she's just the latest in a line of Fire Emblem waifus that people latch on to because she's "kawaii desu help me husbando fight for my honor". The same thing happened with Lyn and Micaiah in previous games, and despite some people still desperately clinging to Lyn for god knows why, the phase will pass, just it mostly did for the two of them.
Want: 0%, 0.1%, or 1%, whichever is the smallest one that is allowed by the rules. She was literally created for the purpose of the Marth-looks-like-a-girl joke, and she's by far outprioritized by the only three FE characters that stand a chance at all, Chrom, Ike and Roy, all of whom will most likely make the roster at some point, if not by being on the initial list, then by being DLC. If this comes across as grumpy or grouchy, that's because it is. I'm pretty sick and tired of Fire Emblem waifu-ing going on every goddamn time speculation for Smash Bros. happens. There was enough of it with Lyn pre-Brawl and I figured her getting being an AT was generous as is, but it seems like it's still not died out. Ah well, only one-ish more year till it dies off for a while again.
Roy Prediction: 59% - Now here's a much better character choice. Popular for reasons other than "kawaii desu" and already has a Smash appearance under his belt to boot, plus a planned return for Brawl, and Sakurai expressing regret at cutting him. I'd be surprised at this point if he didn't show up, at the very least as DLC. However people consistently underestimate him, so I'm putting him lower than he ought to be.
Nominations
Samurai Goroh x3
Medusa x2