In addition to what the others have said, Greninja's Up-B is literally nothing like Lucario's. Firstly, it actually has hitboxes (the water), secondly it keeps all momentum upon finishing, and lastly it functions a ton more like Pikachu's in that it's angular rather than curved like Lucario's.
Honestly, Diddy is just as much a semi-clone of Lucario (curved Up-B that loses momentum at the end and chargeable B move) as Greninja is (down-b Counter and chargeable B move).
All the newcomers, from what I've seen, are unique. Some people apparently thought that Rosalina could only be a Peach clone, and she turned out much differently. It seems that Sakurai and his team are working especially hard at making all the newcomers their own individual characters that bring new things to the Smash roster.