In the 'naruto has a mask fanfiction', it might be that Naruto finds the mask himself. He could stumble upon it during one of his adventures, perhaps in an ancient ruin or a hidden cave. The mask could be enchanted or have some special property that draws Naruto to it, and he decides to keep it and figure out its secrets on his own.
The mask in the 'naruto has a mask fanfiction' might be a symbol of mystery. It could hide Naruto's true identity or feelings. Maybe he uses it to conceal a new power he has acquired and doesn't want his enemies to know about right away.
Yes, there are quite a few. You can check fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto has Majora's Mask' and you'll find a variety of stories, some focusing on Naruto obtaining the mask and the chaos or power it brings, others might explore how Naruto's world and the world of Majora's Mask interact in unique ways.
The hollow mask could symbolize Naruto's hidden or repressed side. In fanfiction, it might represent a part of him that he keeps locked away, perhaps related to his past traumas or unacknowledged emotions.
Well, a frequent theme is the clash of two different worlds. The Naruto universe is full of ninjas and chakra, while Majora's Mask has its own unique magic and creatures. Fanfictions often explore how these two worlds collide when Naruto gets the mask. There's also the theme of corruption. The mask has a dark influence in its own lore, and in these fanfictions, it might try to corrupt Naruto or those around him. And of course, the theme of heroism, as Naruto has to overcome the challenges brought by the mask to be a hero in his world.
His enemies, too. They might realize that Naruto is not as straightforward as they thought. If he shows a more cunning side by dropping the mask, they would have to adjust their battle strategies. For example, Orochimaru might find Naruto a more formidable opponent than he initially believed.
It might give Naruto new types of jutsus. For example, if the Kitsune have the ability to create illusions, the mask could grant Naruto the power to use more advanced genjutsu. He could use these illusions not only in battle but also to deceive his enemies in strategic ways outside of combat.
His friends would be affected. For example, Sasuke might see Naruto in a new light and realize that they are more similar than he thought, both having their own inner struggles. Sakura would also be more empathetic towards Naruto and might try to be a better friend, offering more emotional support.
One possible reason could be for disguise. Maybe he is on a secret mission and doesn't want to be recognized easily. In the Naruto world, there are many dangerous foes, and wearing a face mask can help him blend in or hide his identity from those who might be targeting him.
It could be Sasuke. He might be wearing a mask for some mysterious reason, like hiding his new powers or a new allegiance. Maybe he's on a secret mission that even Naruto doesn't know about at first.