One popular type could be those that focus on epic battles within the allied shinobi forces. For example, fanfictions where they face a new and extremely powerful enemy that tests their combined strength and strategies. These can be exciting as they often show different characters working together in ways not seen in the original story.
The plot could involve the allied forces coming together to face a common and powerful enemy. Maybe a dark guild has emerged with a new and dangerous magic that threatens the whole Fairy Tail world. The OCs could bring unique magics and skills to the table, like an OC with time - control magic who can freeze the enemy's attacks for a short time, allowing the allied forces to counter - attack.
Another way is to join fanfiction communities or forums related to the ninja - themed series. There, you can ask other fans if they know of any good allied shinobi forces fanfictions. They might be able to recommend some that they have personally enjoyed reading. Sometimes, these communities also have their own collections or lists of recommended fanfictions.
One idea could be that Naruto is somehow transported to the Marvel universe where the Avengers are. He could use his ninja skills, like his shadow clone jutsu, to confuse the villains that the Avengers are facing. Maybe he teams up with Iron Man and they combine their tech and ninjutsu to create some really cool weapons or defenses.
Perhaps it's a shinobi who has retired after a long and eventful career. He could be someone who has seen the darker side of the shinobi world and wants to make sure Naruto doesn't go down the wrong path. He might have been a wandering shinobi who finally settles down with Naruto. For example, he could be a shinobi from a different village who has a unique set of skills to teach Naruto.
In a lot of fanfiction, Naruto becomes the God of Shinobi. This is often because the writers want to create a more fantastical version of the Naruto world. By making Naruto a god - like figure, they can introduce new elements such as different power hierarchies, new types of jutsu that are on a divine level, and unique relationships with other characters. It's a way to expand the already rich Naruto universe in a very different direction. For example, in some fanfictions, Naruto as the God of Shinobi has the power to reshape the world or even rewrite the laws of chakra. This not only gives the story a new and exciting plot but also allows for a deeper exploration of the concepts introduced in the original Naruto series.
Often, in Naruto fanfiction, Naruto himself could be depicted as the 'god of shinobi' in some alternate universe scenarios. Since he has the Nine - Tails' power and has achieved great feats in the original series, it's not a stretch for some fanfiction writers to take his powers to a god - like level.
Well, the shinobi rules in Naruto fanfic can be quite diverse. There's the rule of secrecy regarding jutsu. Shinobi are not supposed to freely share their unique and powerful jutsu with outsiders or enemies. Then there's the code of honor in combat. They should fight fairly, not use underhanded tactics like attacking an unarmed opponent. And of course, they are required to respect the hierarchy within the village's shinobi system.
In fanfiction, Naruto might fear a shinobi for various reasons. One could be that the shinobi has a unique and powerful jutsu that Naruto has never encountered before. For example, a shinobi with the ability to manipulate time could be extremely intimidating to Naruto as it goes against his understanding of combat and the ninja world. This new and unknown power could make him feel vulnerable.
I recommend "Online Games: Sword Fairy Doomsday". This novel tells the story of Earth being invaded by aliens. After the Earth's will awakens, it will be reborn in the form of a game-game world for ten years. Xu Feng begins a magnificent journey of survival. Even though it didn't directly involve the allied forces, the plot was similar to the description. It was worth watching. I hope you like this fairy's recommendation. Muah ~😗