Garteam
Smash Master
Diddy Kong only uses two of his special moves in the Donkey Kong series, though. Monkey Flip and Banana Peel are effectively made up unless you want to count Mario Kart as the inspiration for the latter. Peanut Popgun can easily be swapped to the Bubblegum Popgun Dixie wields in Tropical Freeze. For Rocketbarrell boost, you can just make that a Barrell Blast reference or transfer a modified Spinning Kong to her like with Chrom getting a modified version of Aether instead of Blazer. Give her a modified dash attack based on DKC2 and the ability to move quickly with large objects like Donkey Kong using her hair, then you've got most of her differences from DKC2.In regards to some of the characters, Dixie is shown to use her hair alot for stuff, from hovering to carrying stuff to even attacking enemies with her hair. Not to mention Dixie never uses any of Diddy's specials, from the Pop gun to the Jet Pack.
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When someone proposes an echo fighter, it's not born out of a belief that the character couldn't have a unique move set or that they aren't deserving or whatever. It's more an acknowledgment that echoes are a thing that exists and the next Smash game will likely add more because they're an easy way to get some extra faces into the roster. This is especially true for characters that would otherwise miss the boat if they couldn't be echoes. Let's be real here, Zack and Roxas could be unique fighters, but they have a snowball's chance in hell at a unique moveset.
Would people rather have a unique Dark Samus moveset rather than one where she uses Samus' abilities, most of which have never been used onscreen before? Yes, but they'd also take echo Dark Samus over not having her be playable at all.