Well, one idea could be exploring how a criminal family within the Naruto universe might have unique jutsu or abilities that are used for illegal activities. For example, they could have a jutsu that allows them to steal chakra undetected.
One idea could be a crossover where Naruto characters are wrongly accused of crimes in the RWBY universe. For example, Naruto could be framed for stealing Dust in Vale. The story could then focus on him proving his innocence while also learning about the unique aspects of the RWBY world.
One idea could be a story where a detective discovers a criminal intent that is part of a larger, elaborate conspiracy. Another could be a fanfiction based on a well - known crime drama, exploring the criminal intent of a character who seems innocent at first. Maybe a story about a criminal mastermind's intent being thwarted by an unexpected hero.
You could also write about Naruto's family during a time of peace. How they interact with the other families in the village, and how they pass on the values of the ninja way to the next generation. It could include family outings, training sessions that are more about bonding than combat, and the family's role in maintaining the positive atmosphere in the village.
In some 'naruto abandoned family fanfiction', one idea could be Naruto's struggle with feelings of abandonment and how it shapes his character differently. He might become more distrustful or overly independent.
One idea could be a crossover where Naruto characters end up in Quahog. Maybe Naruto and Peter Griffin become friends and Naruto tries to teach him some ninja moves. Another could be Stewie somehow getting his hands on Naruto's ninja tools and causing chaos in both their worlds.
Another concept could be a family guy character, like Peter, becoming a ninja in the Naruto world. He would struggle with the strict ninja training because of his lazy and gluttonous nature. But through his interactions with Naruto and the other ninjas, he could learn some valuable lessons about discipline and friendship. For example, he might start off as a joke but gradually earn the respect of the Konoha villagers.
One plot idea could be that Naruto is framed as an S - rank criminal. Maybe someone planted false evidence against him, and he has to go on the run while trying to clear his name. He might have to team up with unlikely allies, like some of the Akatsuki members who also believe he's been wrongly accused.
In some Naruto criminal fanfiction, a character could be framed for a crime they didn't commit. Let's say Naruto is framed for stealing a powerful weapon from the Hidden Leaf. He then has to prove his innocence while also finding the real culprit who is behind this elaborate scheme to create unrest in the village.
One idea could be a gamer who is wrongly accused of a cyber - crime within the game world and has to prove their innocence while facing off against powerful in - game enemies and real - world skeptics.
Well, you could write a fanfiction where the BAU team gets trapped in a virtual reality world created by a tech - savvy unsub. They have to solve puzzles and cases within this virtual world in order to escape. Or perhaps a story where a new agent joins the team who has a psychic ability that they keep hidden at first. But as the cases progress, this ability starts to surface and help the team in unexpected ways.