Clone characters are better than unique characters in my opinion. It is always vastly interesting to see a different approach to a familiar move-set resulting in a character that usually offers more (or something entirely different) than the original. Jigglypuff is a good example of a semi-clone taken to the next level. Luigi is a good example of how a clone can become something more, he is just vaguely reminiscent of his counter-part. Roy and Marth's sword mechanics accented each-other perfectly. I believe Falco had the exact same move-set as Fox, but through the different properties attributed to each move, they play nothing alike. Ganondorf was the antithesis of Captain Falcon. Pichu actually had the MOST unique mechanic in Smash history. So on and so forth.
That, to me, is more interesting than a character with an entirely new move-set. It is great to have characters that offer an entirely different play-style or mechanic; however, I prefer that the character has an established move-set turned unique over a newcomer that just happens to have a non-cloned move-set. I am looking at characters like Greninja.
It is better to have two characters that contrast each-other in the most beautiful of ways than to have two unrelated characters that feel similar to other cast members. Again, looking at you Greninja.
I have nothing against Greninja, by the way. He is just such an easy example of a character with a different move-set that offers barely anything new or interesting. This game, Smash 4, did a great job of diversifying the cast. I adamantly believe that this is the best newcomer roster because of such. I do not give half a **** about the characters in the game (I can say that with little difficulty because I literally got all of my wanted characters minus Black Shadow anyways).
I have no idea why I rambled so long about this. It is not even relevant in the grand scheme of things, clones ARE in the game, they DO offer something unique, and I like them more than I like regular characters. Everyone else can cry me a salty river and deal with it.
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These, these my homies still.