Oh look, more from Sakurai:
https://www.sourcegaming.info/2016/02/23/nintendo-dream-interview-with-sakurai-part-2/
"Final Fantasy (FF below) is one of the few uniquely Japanese game series revered by players around the world. I think fans across the globe have hoped a character from one of those series would appear in Smash, so it was only a matter of time. At the same time, there are only so many big-name titles we can work with at this point—mainly because we’ve covered most of those bases. Aside from the major globally-recognized franchises already featured in Smash, there really aren’t that many left."
He then goes on to say:
"And within the FF franchise, Cloud is without question the most popular choice. A number of people fixate on the fact his original game was never released on a Nintendo console, but if we were to limit our choices to characters who appeared on a Nintendo console, we’d end up with Bartz from FFV or the Onion Knight from FFIII—how would that work? Maybe they could change jobs or something… Actually, that would be kind of interesting (laughs)."
Hue hue, indeed, but, please, continue sir:
"At the same time, I think it’s only natural to prioritize the character who enjoys worldwide popularity. I might have had misgivings if Cloud had never appeared on a Nintendo console in any form, though."
He then talks about working with Square Enix:
"They supervised the development, providing detailed feedback and harsh criticism, but they didn’t make much in the way of requests. We have our own format for designing content in Smash, and they were gracious enough to grant us considerable freedom when devising Cloud’s attacks, animations, and Special Moves."
In other words, Square pretty much breathed down his neck the entire time like an asthmatic moose.
He then talks about working with Bayonetta:
"My first concern with Bayonetta was devising a way to maintain the flavor of her games.
In order to efficiently progress through the original Bayonetta, her Dodge Offset technique is absolutely essential since it allows you to dodge mid-attack and continue a combo. I wanted to preserve the concept of holding down the attack button being advantageous, so I included her Bullet Arts in Smash. In addition, I took pains to implement combo and Special cancels for stringing together chains in true Bayonetta fashion. Unfortunately, combo characters don’t exactly fit the fundamental model of Smash."
Once again, sticking to the nature of the character and the games is incredibly important to Sakurai.