I dunno, I think Link is awesome as he is. I played am stuck in Zelda 2 and got the fairy spell, and was like "OK, so now what? I'm a fairy? This is boring. If an enemy touches me, do I disappear and fully heal the enemy or something?" I like Link's style as it is, I just think he needs to be buffed for the next SSB (faster moveset and move/airspeed, maybe some moves a little stronger, a better recovery). Besides, if you start making it so every character can transform, the whole idea of transforming becomes silly. It's special because only a handful of characters can do it.