Well, I don't agree with the notion that she has the "most" potential to be completely unique. A LOT of characters have PLENTY of potential to be completely unique. Ridley, K. Rool, Isaac, Shulk (don't know much about Xenoblade but I know this much), Dixie, Ray, RH character, Bandana Dee... even Chrom COULD be unique, though of these he's the only one that wouldn't bring anything new, hence why he was left out.
The thing with Animal Buddies is no other character has used Animal Buddies from DK. Then again, that might be a great reason to give Dixie Animal Buddies. I can definitely see a Squawks recovery and an Animal Buddy Final Smash. I do NOT want her to have her guitar as a Final Smash; DK already has his Bongos. Her guitar should be a taunt, an ending, and perhaps she could actually use it as a special. But definitely not a Final Smash.
But I'd absolutely LOVE her using her hair and Bubble Gum for numerous different things. The Bubble Gum especially would work for a Side Smash, and even the Gumball Popgun could potentially work as a "sticky" gun that can hit opponents to slow them down, or hit the ground and get people stuck.
Barrels and Jet Barrels anyone DK can use, those are really more items. And Jet Barrels are Diddy's thing, I'd rather not have Dixie use that. I've come to like the idea of Squawks a lot, I really hope Sakurai considers this possibility for her recovery.