In this fanfiction, Naruto might use his new 'boogie man' status to play pranks on his friends in a more stealthy way. For example, he could use his newfound abilities to move around unseen and startle them at unexpected moments.
His friends would be the most affected. For instance, Shikamaru, who is used to Naruto's normal self, would have to adjust to this new and somewhat spooky Naruto. He might have to come up with new strategies to deal with Naruto's new abilities and behavior.
Well, it could be that the author took the concept of Naruto and twisted it to make him into the 'boogie man'. Maybe Naruto has some dark power or is involved in some spooky events. It could be a really interesting take on the Naruto character, exploring a side of him that is far from the usual heroic image we have of him. For example, he might be seen as a threat by the villagers in this fanfiction, instead of a hero like in the original series.
You could try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3). They have a large collection of Naruto - related fanfictions and there's a chance you'll find 'naruto is the boogie man' there.
The Boogie Man is a mythical or fictional character often used to scare children. In the original story, the Boogie Man was said to lurk in closets or under beds, coming out at night to frighten kids. It was a way for parents to get their children to go to bed or behave, by warning them that the Boogie Man would get them if they didn't.
One way could be through a time - travel or dimension - hopping plot device. Maybe Naruto gets sent to the Mega Man universe and is immediately fascinated by the high - tech world and Mega Man's heroic deeds. He starts learning about the different robots and their functions, and decides to become a fan. Another idea is that some kind of crossover event occurs in Naruto's own world. For example, a strange artifact is discovered that contains knowledge of the Mega Man universe, and Naruto, being the curious ninja he is, delves into it and becomes a fan.
Another possibility is that Naruto, in this fanfiction, is given a power similar to Saitama's. He then has to deal with the consequences of having such overpowered abilities. He might struggle with not being able to have a real challenge in battles anymore, just like Saitama. And he could try to find a new purpose in life, perhaps using his new strength to help the people in the One Punch Man universe in a more efficient way than he did in his own world.
Once upon a time, there was a little boy named Tim. As he was going to bed, he heard strange noises. It was the Boogie Man! But instead of being scared, Tim bravely said, 'Boogie Man, you should go away!' The Boogie Man was so surprised that he disappeared, and Tim had a good night's sleep.
One common element is that the boogie man is often associated with the dark. He usually hides in closets or under beds. Another element is that he's supposed to be very scary - with a menacing appearance.