Kishi wanted to emphasize that Naruto has matured and his kid adopted his old habits, hence part 3.
Man that sucks.Goku despite becoming all powerful god kept his naive personality
Naruto was also trained by these guys
This guy
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This guy
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This guy
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And this guy
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His Dad also had a sense of humor
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Does Kishi really expect me to believe he matured?It goes against his nature