Well, there are multiple things one can do. Add Parasol/Beam moves, throw in some Fighter/Suplex, add kicking, and bam. Unique, adorable, loveable character. Perfect for Smash. And I'm sure there are many things I haven't thought of off the top of my head.
You know what? I like you.
Personally I feel my basic moveset is the best choice. Not out of ego or selfishness, mind you, but just because of reasons like that. The only things I took from "generic Enemies" for it were the kick moves, but that was also only because of Bandana's Arena description that clearly states "
when the Bandana-wearer kicks..." I also took the grab throws from Fighter Kirby because I felt that they were cool and good enough to be in Smash.
Hasn't anyone noticed how Kirby's moves are all based on something from his home series? Final Cutter from the Cutter ability, the Hammer from the Hammer ability, multiple fighting moves based on Fighter Kirby's martial arts prowess, the forward, back, and down throws from Suplex Kirby and the up throw from Ninja Kirby. While it is true that some of the moves were made just for Smash, they eventually all made it into the movesets of Kirby abilities. The neutral aerial attack is the only Smash exclusive move for Kirby.
.....Aaaaaaaand I just realized that Bandana Dee's Triple Spear Rain is not available to Spear Kirby in Triple Deluxe. This means that this move is completely unique and special to Bandana Dee and was only given to Spear Kirby in RtDL for balancing reasons. Bandana Dee confirmed!