It could be a new villain. A character with a cracked mask might be introduced as a powerful adversary. The cracks in the mask could be a sign of their unstable power or a damaged psyche. They could have a vendetta against Naruto and his friends, and the story would be about Naruto trying to stop their evil plans.
Perhaps it's a long - lost relative of Naruto. The cracked mask could be a family heirloom that has some significance. This relative could have been lost for years and now reappears with the cracked mask, and the fanfiction could focus on Naruto getting to know this family member and uncovering family secrets.
One possible fanfiction could be about the mystery behind the cracked mask. Maybe it reveals a hidden identity or a secret power. For example, the character behind the cracked mask might be an ally in disguise, and the story could revolve around Naruto uncovering this truth.
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.
You can try fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a large collection of Naruto fanfics, and you can use their search functions to specifically look for 'Cracked Mask Naruto Fanfic'. Just type in the keywords, and it should bring up relevant stories.
One popular 'Cracked Mask Naruto Fanfic' might be the ones that explore Naruto's hidden powers beneath his cracked mask. For example, some fanfics could show Naruto having a new form of chakra that was previously sealed by the mask. Another aspect could be how his relationships with other characters, like Sasuke or Sakura, change when this new side of him is revealed. It could add a whole new layer of drama and adventure to the Naruto universe.
Kakashi could be another option. He is a highly experienced and intelligent ninja. If he came across the skull mask, he would approach it with caution. He might study it first to understand its origin and power before deciding whether or not to use it. His calm and collected nature would be a great contrast to the potentially wild power of the mask.
It might also be a completely new character created for the fanfiction. This new character could be wearing a mask for a unique reason, like hiding a special power or being part of a secret organization. The fanfiction could then revolve around this new character's journey and how the mask plays a role in it.
I'm not entirely sure specifically what 'cracked mask fanfic' is about without more context. It could potentially be a fan - created story related to a character with a cracked mask in a particular fictional universe, like in a horror or action - based story where the cracked mask has some significance to the plot or the character's identity.
Sasuke could be a great candidate. He has always been a bit of an enigma, with his brooding nature. He could be hiding a new power or a different side of his personality behind a mask, either self - imposed or as a result of some outside influence. Maybe he's trying to hide his true intentions from Naruto and the others as he pursues his own goals.
It might also be a new character created specifically for the fanfiction. This character could be someone who has infiltrated the Hidden Leaf Village, living behind a mask of false loyalty while having their own secret motives and goals.
Maybe it was Jiraiya. Jiraiya was a very important figure in Naruto's life. He could have given Naruto the mask as part of a training exercise. He might have thought that wearing a mask would force Naruto to rely more on his intelligence rather than his brute strength in certain situations.