One great fanfiction could be 'The Unlikely Bond'. In this story, Naruto discovers a side of Itachi that no one else knew. It shows how their friendship could have developed despite the initial differences. Naruto's optimistic nature starts to break through Itachi's cold exterior.
I really like 'Itachi's Unseen Love'. In this fanfic, Itachi's love for Sasuke is portrayed in a very emotional way. It shows how Itachi sacrificed so much for his younger brother. The writing is very engaging and it makes you feel the depth of their relationship.
There's also 'Itachi and Madara: The Unseen Alliance'. This fanfiction imagines a situation where Itachi and Madara form an alliance for a greater good, against some common enemies that the original Naruto series didn't explore. It's full of twists and turns and the character interactions are really engaging.
A good fanfiction in this regard would have a strong understanding of both characters. For example, Itachi's complex past and motives need to be accurately portrayed. Naruto's growth and development should also be in line with his character in the original series. If a fanfiction can show how these two very different characters complement each other, it's on the right track.
The plot should also incorporate elements from the original Naruto universe well. It could be about them teaming up against a new threat that neither could face alone. Maybe they have to use Itachi's sharingan abilities and Naruto's chakra control together. This makes the story feel like it belongs in the Naruto world. Also, the fanfiction should explore their different outlooks on life. Naruto is more optimistic while Itachi has seen the dark side of the ninja world, and seeing how they influence each other is really interesting.
One possibility for a Naruto and Itachi best friends fanfic could be that Itachi, instead of massacring his clan, finds a way to resolve the conflict with the help of Naruto. Naruto, with his unwavering belief in friendship, could convince the Uchiha clan and the village elders to come to a peaceful agreement. Itachi, seeing Naruto's positive influence, becomes his close friend. They could then train together, with Itachi teaching Naruto some of the more advanced Uchiha jutsu, and Naruto in turn sharing his own unique ninja way with Itachi.
There's also 'The Unseen Bond' which is a wonderful 'Naruto Itachi Fanfic'. This one focuses on the hidden bond between Naruto and Itachi. It shows how, despite their different loyalties and situations, they share a connection that could be the key to bringing peace to the ninja world. The plot twists in this fanfic are really engaging.
One great 'Naruto x Itachi Time Travel Fanfiction' is 'A New Chance'. It offers a unique take on how Naruto and Itachi's relationship could change if they traveled through time. It delves into their past traumas and how they might be able to prevent some of the tragedies that occurred in the original story.
One great 'Naruto x Itachi fanfic' is 'The Unlikely Bond'. It delves into a scenario where Naruto and Itachi have to team up for a mission that could change the fate of the ninja world. The story is really engaging as it shows their different perspectives and how they gradually come to understand and respect each other.
There are fanfictions that explore their friendship during the Chunin Exams. Rock Lee's determination and Naruto's never - give - up attitude are highlighted. They support each other in different ways. Naruto cheers for Rock Lee during his battles, and Rock Lee gives Naruto advice on how to improve his taijutsu skills, making their friendship a central and heartwarming part of the story.
One great 'Sasuke and Itachi Fanfiction' is 'The Bond Beyond Blood'. It delves deep into their complex relationship, exploring the unspoken emotions between them. The story is set in an alternate universe where they have to team up against a new, powerful enemy. It shows how they gradually come to understand each other better in the face of danger.