In a fanfiction scenario where Naruto starts the 4th Shinobi War, it would completely change the whole Naruto universe's narrative. Naruto is known for his desire for peace, so if he starts the war, it might be due to some extreme manipulation or a misunderstanding of the situation. For example, he could be tricked by an enemy who has disguised themselves as an ally and convinced Naruto that starting the war is the only way to protect the Leaf Village. This would lead to a situation where all his friends and comrades would be forced to either oppose him or be dragged into a war they didn't want.
'The Unseen Hero of the 4th War' is a great one. It focuses on a character who is often overlooked in the original story but plays a crucial role in the fanfiction. The writing style is engaging and it really dives deep into the character's emotions during the chaos of the war.
The story would take a very dark turn. Allies would become enemies, and Naruto would be seen as a villain. His friends would be divided, some might try to understand his reasons while others would fight against him immediately.
In a Naruto 4th Shinobi War fanfiction, we could have a plot where the Akatsuki actually had a hidden agenda that was not related to the tailed beasts at all. They could be using the chaos of the war as a distraction to perform some other dark ritual. And perhaps a young shinobi discovers this and has to race against time to stop them while also fighting in the war.
I think Rock Lee. He's often overshadowed by the more powerful ninjas with special abilities like Naruto and Sasuke. But during the 4th Shinobi War, his sheer determination and hard - work - based fighting style could have been explored more. He could have had some really cool moments against the stronger opponents.
First, you need to do research on both universes. Know the rules of magic in Harry Potter and the abilities and politics in the shinobi world. Then, come up with a unique plot that ties the two together. For example, a dark force could be threatening both worlds. Decide on which characters from each side will be the main protagonists and antagonists.
Naruto would be an obvious choice. He played a major role in the original 4th shinobi war. But in a fanfic, you could explore different aspects of his character, like his internal struggles during the most intense battles.
A third idea is a story centered around a shinobi who was thought to be dead but actually survived and is now trying to get back to the battlefield. Along the way, they discover secrets about the origin of the war or new jutsu that could turn the tide of the battle. They have to overcome their own physical and mental weaknesses while also evading the enemy who believes them to be dead.
One idea could be focusing on a minor character's perspective during the war. For example, a young genin who is caught in the middle of the chaos. They could witness the great battles between the powerful shinobi and have their own journey of survival and growth.
One idea could be exploring the backstories of minor characters during the war. For example, how a random shinobi from a small village coped with the chaos. Another could be a what - if scenario, like what if a certain alliance was formed differently. Maybe a group of rogue ninjas decided to side with one of the major villages instead of staying neutral.