Tetsuya Nomura, one of the creators of Kingdom Hearts and the series' recurring director and lead writer, admitted in an interview with Game Informer that it was actually him, not Disney, that was almost hesitant for his character Sora to get in Smash.

"Obviously, I was very happy that we were able to have Sora make an appearance in Smash Bros. Ultimate. Most of the feedback when Sora was [announced] for Smash Bros. Ultimate was, ‘I can’t believe Disney okayed for him to be in this game.’ Behind the scenes, I was actually the one being very picky about his appearance in Smash Bros. Disney was the one that was like, ‘Go ahead! This is a great opportunity.’ I thought it would be tough to pull off because it might clash with the established lore in Kingdom Hearts and the Disney worlds, so it was an opportunity I had to consider very carefully. After seeing how happy everybody was in welcoming Sora to Smash Bros., I feel like the end result was really great."