If Diddy gets tail moves... Damn you BKupa, you know my weakness! Yes. That way I'd take Dixie as a Diddy clone. It just has to fit well, and not look cheap. And tail based moves would help Diddy to. Helicopter Spin could work in function as Diddy's Up B to, but be farrrr more floaty.
Ok, am convinced now. Clones are a good idea.
There are many characters requested now that wouldn't exactly be too unique from another already in. I wouldn't mind a few clones, if done right.
Dixie Kong - Diddy's clone with better recovery, less speed, weight and power and more floaty.
Chrom - Ike clone. Neutral B being a fuse of Ike's and Marth's Melee B.
Roy - Marth clone. Neutral B as in Melee, but has range on the full charged version.
Impa - Sheik clone with Barrier as Down B. Little more powerful, little slower, better recovery and range on kicks. Tall and light though. More of a Wolf / Lucas to Sheik. B is a charged up Magic Orb similar to the Needles, but stronger. Chain is the Whip from Skyward Sword.
Black Shadow - Captain Ganondorf a la Melee.
Toon Zelda - smaller, faster, weaker, floatier Zelda
Tetra - smaller Sheik that throws Daggers and uses the Grappling Hook as a Chain.
Paper Mario - Mario with the Hammer as Side B. Slower, stronger and lighter than Mario. Kinda plays as N64 Mario.
These are a couple I wouldn't mind if it meant more characters to be honest.