also i would have wanted to be taught to hiruzen, because even itachi kept it real with him U_Uyeah, and almost all of itachi's elders respected him, despite his young age. kakashi would be a good one as well, and J-man does have lots of knowledge, and I also think I'd never stop laughing with him around.
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but kakashi has over 1000 jutsu to teach you, depending on if your a prodigy or not, that knows the elements like nagato.Itachi plain and simple. U_U
I want to learn strategy from him.
If not Itachi, then Jiraiya. He seems like someone I would be having a great time with.
Kakashi would be too boring. >__>