In this fanfiction, Naruto could be a patient in Arkham Asylum. He has lost his memory and believes he is in some strange version of Konoha. The doctors at the asylum are trying to understand his 'delusions' about ninjas and chakra. Meanwhile, some of the more evil inmates sense his power and try to manipulate him for their own gain.
A 'naruto in arkham asylum fanfiction' would likely involve Naruto being transported to the Arkham Asylum universe. He would be confused at first, but then quickly adapt. His chakra abilities would seem like magic to the inmates and staff. He might try to find a way to get back home while also getting involved in the internal power struggles within the asylum.
One idea could be that Naruto is somehow transported to Arkham Asylum. He might initially be confused by the strange new world, but his ninja skills could come in handy. For example, he could use his speed and agility to avoid the traps and villains in the asylum. Maybe he teams up with Batman, who is intrigued by Naruto's unique abilities.
Naruto might end up teaming with some of the more sane inmates who have a sense of right and wrong. For example, he could form an alliance with a reformed criminal who wants to help Naruto navigate the complex and dangerous world of Arkham. Together, they could try to expose the corrupt elements within the asylum.
One great 'Batman Arkham Asylum' fanfiction is 'The Dark Knight's Redemption'. It delves deeper into Batman's psyche as he battles his inner demons while trying to escape the asylum. The author does a great job of capturing the dark and gritty atmosphere of the game.
Naruto's shadow clone jutsu could be really useful. He could send clones to scout out different areas of Arkham Asylum while he and Batman plan their next move. This would give them an advantage in a place full of hidden passages and threats.
His Rasengan could be a very destructive force. In the close quarters of Arkham Asylum, it could cause a lot of damage to the walls and cells. The guards and inmates would be very intimidated by it.
First, know the source material well. Understand the characters, the setting of Arkham Asylum, and the overall mood of the game. For example, Batman is a complex character with a dark past, so make sure to capture that in your writing.
A more complex fanfiction could involve all of Team RWBY in Arkham Asylum. Blake could use her stealth skills to move around unnoticed, Yang's strength would be useful in physical confrontations. They could be there because some powerful enemy has lured them there, thinking it's a place where they'll be weakened. But together with Batman and some of the inmates who might side with them (like Harley Quinn who has a complex sense of morality), they could turn the tables on the enemy.