One interesting idea could be the revelation of Naruto's real face in terms of his family heritage. Maybe the fanfiction delves into secrets about his parents that were not fully explored in the official story. It could show how Naruto discovers these secrets and how they change his perception of himself and his place in the ninja world.
One idea could be that Naruto gets his face burned during a battle against a new and powerful enemy. He then has to deal with the physical pain as well as the psychological impact. People in the village might react differently to his changed appearance, some with pity and some with fear.
One idea could be Naruto living in a modern city and trying to find a job. He might use his ninja skills in unexpected ways, like using his speed to be a delivery person. Another could be Naruto going to a normal school and having to deal with bullies, but then using his ninja training to stand up for himself and others.
One idea could be a fanfic where Naruto's face mask becomes a magical item. Maybe it has the power to hide his presence completely from enemies, leading to some really cool stealth missions.
One idea could be a story where the members of the face family go on a magical adventure together. They could discover a hidden world full of strange creatures and have to use their unique traits to overcome challenges. Another idea is a face family fanfiction set in a different time period, like the Victorian era, and how they adapt to the new social norms and customs of that time.
Perhaps it delves into Naruto's past in a more detailed way. It could show events that shaped him before we meet him in the main story. For example, his experiences as an orphan and how that really affected his mental state. This can give a whole new dimension to his character.
One interesting face painting idea is to create a butterfly design. You can use bright colors like purple, pink and yellow. Start with the body of the butterfly in the center of the forehead and then paint the wings on the cheeks.
One interesting idea could be the combination of Naruto's ninja skills with mecha technology. For example, Naruto might use his chakra to power up the mecha in unique ways. Another idea could be the new enemies that are created specifically for this mecha - Naruto concept, like robotic shinobi that require different combat strategies compared to normal foes. Also, the design of the mecha Naruto itself can be really cool, perhaps with features inspired by the Nine - Tails.
In a 'The Avengers See Face Fanfiction', a cool plot could be that the team is affected by a strange energy that makes them see the faces of their greatest fears instead of their normal faces. For Iron Man, it could be seeing the face of a world destroyed by his technology. Black Widow might see the face of all the people she's had to kill haunting her. Then, they have to find a way to overcome these fears and break the spell. Another idea is that there's a new member joining the Avengers, but every time they look at this person, they see a different face each time. It turns out the new member has a power that they can't control yet, and the Avengers have to help them master it. Also, a plot where the Avengers see the faces of their deceased comrades during a crucial battle, which gives them the extra motivation and courage to fight harder.
One idea could be to explore the backstories of the Ghostbusters' equipment. For example, how Egon came up with the design for the proton packs. Another could be a story where the Ghostbusters have to deal with a powerful ghost from another dimension that has unique abilities they've never faced before. Maybe a story about the team's early days, when they were just starting out and trying to get their business off the ground.
Another idea is that Aizen somehow ends up in the Naruto universe during the time of the Fourth Great Ninja War. He could try to manipulate both sides for his own gain. But Naruto, with his ability to see the good in people, might try to reason with Aizen and show him a different path. It could be a story of redemption or a great battle if Aizen refuses.