Thank 8-Bit theatre for this one.
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Kakashi was worried.
All ninjas picked up a habit.
Some habits had weirder ones than others, but eventually, every ninja picked up a habit. Or went insane. Sometimes both.
Habits were comforting, an outlet for their building stress and the overwhelming paranoia that the ninja world eventually inflicted on people.
If a ninja was smart enough, they'd pick up a habit that wasn't overtly detrimental to their performance. Kakashi's love of Icha-Icha, while some prudes would say it was unseemly, was infinitely better than Aoba's cocaine and heroin addiction.
Naruto Uzumaki, when Kakashi got him, had spent three long years pretending he was a robot. At least, according to the reports from the Academy.
It was clear to Kakashi that the "habit" in question was actually insanity.
The boy had clearly snapped at some point. His "robot" habit even got him failed out of the Academy three times because, quote, "Robots have no chakra!".
Then the Mizuki incident occurred.
Everyone in the entire village could hear Naruto's proclamation of "BEHOLD MY HUMAN LASER!"
Kakashi glanced up at the Hokage monument, where the beam Naruto had used to vaporize most of Mizuki's torso had continued to strike Shodai's left eye, and replace it with a gaping hole that extended five miles before punching out of the ground and continuing into space.
Naruto had shown up to his interview wearing a very cheesy and painfully fake black handlebar mustache.
He was still wearing it.
"Naruto, please take that off."
"Naruto? I am not Naruto. My name is WarMech." Naruto answered, "Can't you tell by my Robotic Mustache?"
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Yes, Naruto has imprinted on WarMech from 8bit Theatre, who was originally the nastiest optional boss in the first Final Fantasy. Of course, he's actually a random enemy (though limited to the top floor of the Sky Palace), which makes him more horrifying as he's considered tougher than the final boss.