I don't want Dixie to have a Yoshi/Ness/Mewtwo-esque double jump. I'm absolutely terrible with all of them because I could never get used to it. If Dixie had one, I would fight day and night to get used to it just because it's Dixie, but for the sake of my selfishness, I don't want it xD.
I'm not a big fan of Dixie becoming a recipient for a moveset of Animal Buddy specials, I think it undermines Dixie's own capabilities, having a Rambi charge attack sounds fine, but using Squawks to recover when she can just use her ponytail to me sounds like a big no.
Dixie on her own can fight very well with defined special moves that she showed in her game appearances, the Gumball Popgun, using the ponytail to hover, flight, grab items and slam the ground. Some liberties can be taken to give Dixie the guitar attack from Diddy in DK64 or one of Tiny's moves, but I don't think that would be required at all. The only time I would think to do that is to fill the gimmicky Down B which is the big fat Question Mark of Dixie's moveset (I really, REALLY don't want Banana Peel).
I'm never going to oppose to Kiddy becoming a Tag Team with Dixie tho. A mix of
and
is a novel idea and basically represents what was the core element of the first three DKC games. Imagine if both had their own movesets and the swap button was down special, then some specials in both Kongs were based on the Team Tag Throw. Like
ZeroJanitor
mentioned, if the leader is Kiddy, she can throw Dixie as a projectile like his DKC3's throw and also his Up Special is throwing Dixie to the ledge to recover, without her, he's doomed like solo Popo.
If Dixie is in front, she could initiate a partner roll with Kiddy like she does with DK in the Retro games (I know it was in DKC3, but it was basically a gimmick and a very useless one by the way), or she could throw Kiddy as a stupidly powerful slow projectile that doesn't have that much reach. Shame Kiddy is so divisive, this idea sounds good on paper, if you asked me, I would prefer to go with solo Dixie, because she totally deserves her own spot at this point. But with this current trend of every newcomer having a special gimmick. I could totally see the team-up happening, and I wouldn't complain either. Maybe after DKC3 gets added to Switch online more people will ease their opinion on Kiddy.