Also, on the topic of Ganondorf being a Captain Falcon clone...at this point in the game, I've kind of just accepted it. It's kind of endearing how the King of Evil has the Cap's moveset. Maybe buff him up a bit, make his moves a little more different from Falcon's, and I'd be good. His lack of a sword never really bothered me, since we have plenty of sword wielders.
The idea someone posted a few pages back with Ganondorf having a new moveset that allowed him to switch between his sword and fists, however, is what I had in mind for Takamaru, since in Nazo no Murasame Jou he switched between using his katakana and shurikens depending on how close he was to the enemy. So, like, Down-B could sheath/pull out his sword. With his sword out, he'd be a bit slower, but his sword would have knock out power, while with his sword sheathed he'd be faster and able to rack up damage, but not a lot of knock out power. So you'd weaken your opponent out, draw your sword, and then finish them off.
And even though it'd mean we'd have two samurai, I also want Goroh to get in, but not as a Takamaru clone. Rather, I think he'd be neat as a heavy swordsman (his weight coming from his body as opposed to his sword like Ike), who would be a bit unorthodox compared to other swordsmen as he would have a lot of physical, wrestling-style moves like backflips and body slams, since he's a pretty big looking guy.
Finally, I'd like to note that I definitely think Square Enix has a possibility of having a 3rd party rep, what with Mario Sports Mix, 3-on-3 Hoops, and Fortune Streets international debut all serving as recent crossovers between the two companies. Originally I thought Slime would make a good candidate, since no other Square Enix character is really a "franchise", so to speak, since Final Fantasy and DQ have new leads each game. However, with Neku revealed to be in KH3Ds, and the possibility of a TWEWY sequel, I now hope Neku Sakuraba from the World Ends With You gets in as a 3rd party rep, simply because his debut game was awesome and some of his game's music being included in Smash would rock.