Louie G.
Smash Hero
I don't really believe that either have been important in the past (see clones and Ganondorf), but Sakurai has stressed uniqueness in Smash 4, so I think it would be being unique. Obviously there are characters that are NOT true to their games that are perfectly fine being untouched. For example, Ness and Lucas rep their games well, but they use the attacks of their enemies, not being true to their character. It still works perfectly though.Here's a question fitting that I'm interested to see people judge...what do you think is more important for a character? The fact that they become unique or the fact that they should be a character that's true to the games they come from? (Not including characters that require source material to be created because of lack there of in their actual game, EG: Captain Falcon and Pit)
Edit: You know what, I take it back. They are both very important, I was just going by what's more important to Sakurai.