Naruto as the series lacks the scary factor altogether :|
I'm a big horror fan and nobody in this manga/anime scares or disturbs me.
Hypothetical then.In all honesty though, no characters in Naruto have or could ever even make me feel the slightest bit nervous.
I agree that it isn't scary. At least, it doesn't scare me. There are parts that I'd assume scares some people.
So I should say, who would be the most scary? Or maybe, who scares the most people in NV? I dunno.