Q4: “Why did you decide to introduce a strong enemy like Zabuza right at the beginning of the series?”
A: Kishimoto says that he wanted to do this right off the bat to show off Kakashi’s strength as an example of what an experienced ninja can do in the Narutoverse. This would set some cornerstones down in the manga straight away and make it easier for the audience to put things into perspective. Kobayashi points out that there were many things introduced in this arc that played huge roles right until the end of the series (kekkei genkai, sharingan etc), but Kishimoto just said he was ‘bluffing’ with these things in the beginning [nb: in other words he just made them up without any thought on how to use them in the future]. At the time he was just making these things up for the excitement and suspense, but didn’t pick up on what to do with some of these threads long-term until later. Basically he was making it up as he went. Even with Sasuke’s backstory, at the time of the Wave Arc, all that had been thought out was that Sasuke had an elder brother who had done something bad, and that was it. Kishimoto admits the planning was very hazy at this point. However,
at the point where Itachi is actually introduced, Kishimoto had decided to secretly make him a good guy, but the reason he did something bad was because of circumstances. Kishimoto also says that although he introduced the Sharingan as being able to copy moves, the premise on what the Sharingan could do changed drastically over the course of the storyline.
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