On Topic: What other characters have moves that no one really uses??
All I got is Jiggly's Sing
Jet Hammer seems like the kind of move that is rarely ever used by anyone.
Though, that's rather ironic coming from me after I've managed to get a couple of good K.O's with Jet Hammer in my battles with you, Poppy, James and Fastblade. Still, to me it seems like a rarely used move overall. I don't use it that often myself.
And Sing could seriously use a range buff, or perhaps a buff that makes it harder for players to wake back up after falling asleep thanks to this particular move.
As for the current topic-
To me, Zelda in Skyward Sword is probably the most expressive, and looks very innocent and fitting for the role of a princess. I just really like how Twilight Princess' version of Zelda looks, the dress, the hair, the eyes, they all look good to me.
I concur, Zelda's SS design was the most expressive and had a very fitting design for a princess. I still prefer TP's design for Zelda and I think her design fits the Smash scenario well, while she still looks like a princess, she also looks one who would be a a brave leader, and one who isn't afraid to get involved directly in a fight when need be. I'd be fine with either version in the next Smash, but I'd much prefer the TP version again. (I'd think her colors would be a bit brighter this time though, and a palette swap made to closly resemble the coloration of Skyward Sword