I've been thinking about this lately:
Will the Chorus Kids get into this Smash after being cut from the last ones? After hearing the whole "I hope you don't expect too many newcomers" thing, I came to the conclusion that the answer is almost certainly "no" as it seemed that the development team would be focusing all of their efforts on bringing back old fighters and then adding Echoes and highly-requested newcomers. But just recently I thought of something that I hadn't given much consideration to previously: they were almost certainly cut after development began on them. I believe this might just be their saving grace. Remember, the Ice Climbers were built to a playable state on the Wii U version before being cut due to the limitations of the classic 3DS/2DS. The Chorus Kids were cut at an unknown point in development, likely due to being a multi-character like Nana and Popo and thus facing similar issues. Let's break down how their series were represented in the final games:
Ice Climber
- Smash Run enemy
- Two songs
- Several trophies
Rhythm Heaven
- Smash Run enemy
- Two songs
- Several trophies
The two most likely explanations for why Rhythm Heaven would have received similar amounts of representation as Ice Climber are that the Chorus Kids were cut after a fair amount of development had been done and a version of them was implemented into the Wii U version, similar to Ice Climbers, or that Sakurai was invested enough in the idea of representing the series in Smash that even after the character concept was scrapped he had the team implement these other elements into the games. Given the presence of the Rhythm Heaven series icon data among the fighter franchise icons, I'm inclined to believe that there was in fact a fair amount of work done on them before being cut (though the second possibility is likely true to some extent, as well). My point in bringing all of this up? Well, the Ice Climbers were brought back in Ultimate, and since this game is
obviously a port largely built off of the framework of the previous version just like the other games in the series were in their initial stages of development, surely their return was facilitated by the fact that they already had quite a bit of work done from the start, making them easier to develop than a character that would need to be made from scratch. With the relatively limited resources available to be used on newcomers with everyone and nearly everywhere being here, so to speak, just as Echo fighters now make even more sense than before as a means to offer fans new characters to play as, it would make perfect sense for the team to also return to the partially-developed Chorus Kids for a comparatively-easy newcomer. Add in the relevancy of the RH series at the time that the project proposal was completed (Megamix released in Japan in June 2015 with an American release planned for the next year, and the proposal was made in December 2015) and the fan demand for a Rhythm Heaven character in the Smash Ballot (which, admittedly, was limited, though certainly not nonexistent), not to mention Sakurai's penchant for adding in a crazy character pick or two in each game which may be in jeopardy of not being feasible this time with the aforementioned strained resources, and I think it all adds up to a pretty solid case for why the Chorus Kids are likely to finally bring the beat in Super Smash Bros. Ultimate.