It's been a long-running...well, not really a rumor (though apparently it was), but it's been an accepted thing for a while now that the idea for fusion was given to Toriyama by Masakazu Katsura. Where exactly did this information come from, was it from Toriyama himself in an interview, or a guide book, or what?
The reason I ask is because, in a recent interview with Katsura, he claims it wasn't really his idea, but their discussion about a similar thing in tokusatsu shows that led to it.
http://www.sjalpha.com/katsura-nycc-interviewSJA: Is it true that you came up with the concept of “Fusion” in Dragon Ball Z with Toriyama?
MK: [laughs] It wasn’t actually me who came up with the idea of Fusion. It’s actually true that after making the characters go Super Saiyan, Toriyama was having trouble thinking about new ways to power them up. One time on the phone, we were talking about tokusatsu (special effects) TV shows, and how in one series when the two main characters cross their arms, they turn into one superhero. I suggested, “What about something like that?” But in general, Toriyama never really listens to anybody else’s ideas. Then he came up with “Fusion.” I know for a fact that he wasn’t listening to my suggestion, but he ended up coming up with a similar idea anyway. It’s sort of a confusing story…so as time passed, it grew into that rumor, I guess.
So...he kind of did lead to the inspiration for Fusion, but the full idea itself wasn't his, exactly? Or is Katsura just not wanting to take credit from Toriyama for this one?


