MonkUnit: what I'm saying is while it is true that other smash characters have gimmicks, none are so thoroughly pervasive as this one. ZSS has stuns on two moves. Link has three projectiles as specials. Fox and Falco have shine, and spacies in particular are Smash shoto. Peach has can float in the air. Pit can fly. Some characters' gimmick is that they don't have any; Captain Falcon is a great example, built of high speed, strong combo moves and a few great finishers.
Lucario's normals cancel into his specials, which permeates throughout the character and completely ignores normal game mechanics, as opposed to being on one or two moves or even being a unique mechanic. Lucario is jus really fast and connects moves together faster than other characters, which is almost not a gimmick at all but simply a really huge advantage. Lucario is a meta. A cool meta, but a meta nonetheless. It's a little air fireball from Akuma's original moveset. Yeah, it was just a move, but no one else had anything like it, so the other characters weren't really built to defend against it and as a result it was never balanced until recent generations. It's cool but the game isn't really built to support it.
I don't think you should completely scrap the idea, but it might be better off as a special in another incarnation. Subtlety.
I'm not even sure why I bother to post this stuff since the P:M team is really good about sticking to their guns and doesn't often listen to normies like me. :D