He could meet the young Hiruzen Sarutobi. Naruto might learn a lot from him about the history and politics of the shinobi world at that time. They could also exchange jutsu knowledge to some extent.
There's a high chance that Naruto would meet Minato's parents. He could form a bond with them, and maybe even share some stories about Minato without revealing his relationship to him. This would be a very emotional and interesting aspect of the fanfiction, as Naruto would be getting a glimpse into his father's family and past.
Naruto might encounter Tobirama Senju. This would be an interesting encounter as Tobirama was a very powerful shinobi. Naruto could be in awe of his water jutsu skills and Tobirama might be curious about Naruto's strange abilities. They could have some intense battles together against common enemies.
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.
In some fanfictions, if Naruto was sent to the Third Shinobi War, he could change the course of many battles. His unique jutsus like the Rasengan might surprise the enemies. He could also inspire his comrades with his never - give - up attitude.
In a fanfiction about Naruto, the Gura Gura Fruit, and the Third Shinobi War, perhaps the Gura Gura Fruit is a new, mysterious element introduced into the war. Naruto, being the curious and adventurous ninja he is, might be the first to discover it. His friends and allies could be initially wary of this strange power, but as Naruto learns to control it, they see its potential in turning the tide of the war against powerful enemies such as Orochimaru or the Hidden Stone Village's forces.
In a 'godlike Naruto' Fourth Shinobi War fanfiction, Naruto could have a connection to a divine entity. Maybe he discovers he is a descendant of a god of the ninja world. This newfound heritage gives him superhuman strength, speed, and the power to foresee his opponents' moves. He uses these powers to single - handedly take on Madara Uchiha and Kaguya. His godlike status also earns him the respect and loyalty of all the shinobi clans, uniting them under his leadership against the common enemy.
Naruto's Rasengan would be a game - changer. In the Second Shinobi War, such a powerful and unique jutsu would be unheard of. He could use it to take out enemy strongholds or important leaders quickly.
Naruto could encounter wandering ninjas who have their own stories and reasons for not being part of a village. Some might be outcasts due to their beliefs or powers, and Naruto's interaction with them could lead to either conflict or new friendships. He may also come across some of the shinobi who fought on the opposite side during the war but now have different outlooks on life. Through these meetings, Naruto gets a broader perspective on the ninja world.
He could meet an old enemy who has also changed after the war. This enemy might now be in a similar situation of being alone and they could form an unexpected bond as they understand each other's isolation.
If Naruto dies in the Fourth Shinobi War in fanfiction, it would have a huge impact. For one, the morale of the Allied Shinobi Forces would plummet. Naruto was the symbol of hope. Without him, many might lose the will to fight. His friends like Sasuke would be deeply affected. Sasuke's whole journey of redemption was somewhat tied to Naruto. His death could also lead to a power vacuum. Nations that were relying on Naruto's strength and his idea of peace might fall into chaos as they scramble for power or new forms of protection.
Rock Lee could be an interesting main character for a Third Shinobi War fanfiction. Since he doesn't rely on ninjutsu, his unique fighting style could be a great asset during the war. We could see him face off against powerful ninjutsu users from other villages and prove that taijutsu is just as effective. Also, his unwavering determination could inspire his comrades during the dark times of the war.
One great Naruto Third Shinobi War time travel fanfiction is 'Back to the War'. It has an interesting plot where the main character goes back in time and tries to change the outcome of the war. The character development is well - done and it stays true to the Naruto universe's lore.