I'm late to the "less discussed characters you want to see" talk, but I thought I'd chime in anyway. Ahem...
Adol Christin from the Ys series!
Ys is in my top 3 favorite video game franchises next to Kirby and Dragon Quest, so you can only imagine how ecstatic I would be to see my favorite red haired adventurer join the roster. I'd absolutely flip. If he'd fight anything like he does in his games, he'd be one of the craziest, funnest characters to play as in Smash. I can think of, like, three different gimmicks he could have, and I could probably make an entire moveset based on his skills from Ys 8 alone! And that's just using one game!
And the music he'd come with? I'm not sure if Smash fans would be ready for it. Just listen to some of this stuff!
Sunshine Coastline
Iclucian Dance
Great Plains: Pan-Gaia
Crimson Fighter
I mean,
THIS is what it sounds like to climb a giant mountain in Ys 8. And
THIS is crossing a desert in Ys 7.
I could go on, but I'll stop myself from typing too much. After the DQ Heroes, Adol would be my ultimate dream character, followed by Arle.
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I don't get to talk about him or his series much, though. Such is life.
Edit: It appears that in the overly long time it took for me to finish this post, the thread has already completely moved past this topic... Just my luck, I suppose.