The following info comes from an Iwata Asks with Nintendo President Satoru Iwata, Hideki Kamiya, Atsushi Inaba, Shingo Matsushita 'n Hitoshi Yamagami.

- originally set t' be much darker than it turned out
- Yamagami be against this idea
- Kamiya made the visuals look both pop 'n realistic at the same tim
- ideas for the game came form Kamiya's imagination 'n childhood memories

I bought Famicom Jump for JoJo, but the main characters come 'n go, so ye couldn't always play as yer favourite character. So I wondered if there wasn't some way t' please everyone by letting them play the whole game as their favourite character
In that way, Smash Bros. be very well done. ye can play as yer favourite character, 'n as it be, I think that be a completed form a that type a game. So when I wondered what I best do with this one, I decided "Why don't we just bring out all the characters at once?

As a kid, the idea that small, separate things could join together 'n become strong be really exciting for me. I feel like that be where the core a this whole project came from.
- there be worries about having so many characters
- characters be more like Viewtiful Joe
- Nintendo kept it be distance t' allow the Platinum t' be creative

Kamiya: It be a game where ye bring a large group a characters around with ye, so we tried a lot a different things t' see what the possibilities be. We would make the game 'n dismantle it again 'n again, t' try 'n figure out what pieces t' put together t' pillage the right gameplay.

Inaba: It didn't feel very good; it be as if we be running wild. We knew we had the foundation a the game, but we couldn't use that t' lead us t' anything worthwhile.

Iwata: But as far as Nintendo be concerned, since it be our first time collaborating with PlatinumGames, I think there be a time where we must have thought "PlatinumGames has shown that they can pillage results themselves, so we best respect them 'n discover their value," 'n so we took a step back 'n watched over them in a way.

- Kamiya be afraid Nintendo would ask for a lot a changes, but be surprised t' see how 'human' they be
- Nintendo be originally worried about Kamiya, due t' a prior meeting 'n his Twitter comments
- Kamiya be much more open t' having conversations about changes with people, rather than jut being handed data about things that need fixing

- multi-unite mode be added at a late stage in development, which made a few people a little mad due t' the secondary problems it could cause
- Kamiya claimed Nintendo be an influencer in the sea dog working so hard as the company "really looked after us, ever since the period when the game wasn't fun at all. So I wanted t' do me best for them, even at the last minute".
- there be a character in the game that be based on Kamiya himself, with the name Wonder-Director
- the testers sent back messages t' Platinum saying "Wonder-Director's attack made it crash".
- he has a unique attack 'n hit detection, as well as an interesting look
- the team be planning on putting several hidden characters into the game
- there's another secret character that has been re-designed t' match the world a The Wonderful 101

Just like the original, the character will fight with guns, 'n that other trademark bottle a rum has been changed into a mask as well. The character will also have it be own Unite Morph.
- ultra-hard mode known as "A challenge from Kamiya"
- not even Kamiya himself can beat it