Only if they took Lucario out. I'd like another PT-like character, he was the most interesting out of all the newcomers in Brawl, and one of the reasons I liked him is because they introduced new pokemon that weren't clones - something they didn't do in melee (I considered the ball-charge type of attack a rip from Samus). I never even understood why shadow-ball was a charged attack. Something like solar beam for Ivy would've been more appropriate. I'm just tired of all the poke-clones so I'm a little biased against more shadow-ball type fighters. They seem to be becoming an archetype instead of a character in general. If they keep making them I'd suggest they just keep Lucario, since other shadow-ball characters are gonna have a similar playstyle (minus the aura), even though I know they won't since he's not too popular. Thing is, since they're including pokeballs in the itemset still, it's reducing the selection of pokemon and it's reducing the moveset they can give them for risk of being too similar to those used in the pokeball pokemon.
EDIT: Since the thread's topic changed while I was replying to it, I'd actually like to see some of link's different costumes in Majora's Mask in SSB4 (Zora/Goron/Deku Link.) Actually, Diety Link would probably be the most representative of TLoZ:MM since he was the best form, and it wouldn't be too hard to make him. Just make the neutral-b the projectile from the game, and have similar, longer-ranged sword attacks to Link. Or make his FS a transformation to Diety. That'd be pretty cool too if you don't wanna make another similar character to Link.