They could develop a mentor - mentee relationship. Itachi uses his knowledge of the Sharingan to teach Naruto new combat techniques. As they train together, they bond over their shared experiences of loss and their desire to protect the people they care about. Naruto might also help Itachi come to terms with his past actions and find some peace within himself.
At first, it's likely to be very awkward. Naruto is a very open and energetic person, while Itachi is more reserved. But as they are forced to spend time together because of the arranged marriage, they start to find common ground. For instance, they both care deeply about protecting the village in their own ways.
Itachi would be very strict in Naruto's training, but also very caring. Naruto would look up to Itachi and try to learn as much as he can from him. As Naruto grows, he might start to have his own ideas which could sometimes clash with Itachi's. But through communication and understanding, their relationship would become deeper. Itachi would share his past experiences with Naruto, which would make Naruto understand the complexity of the ninja world better, and in return, Naruto's innocent and determined nature would slowly change Itachi, making him more hopeful about the future of the ninja world.
Their relationship could be developed through a series of flashbacks. For instance, Itachi could recall moments from Naruto's childhood that he observed while in the ANBU. These memories could make him see Naruto in a new light. Meanwhile, Naruto could learn about Itachi's past and the sacrifices he made. This exchange of knowledge could build a bond between them based on empathy and respect. In addition, they could train together in secret, with Itachi teaching Naruto some of his ANBU skills, which would also strengthen their relationship.
In some fanfictions, it could be through a special jutsu or ritual. Maybe Itachi, before his death, transferred his Sharingan to Naruto in a unique way, perhaps using a forbidden technique that was known only to a few in the Uchiha clan.
They could develop a mentor - mentee relationship. Itachi, with his vast knowledge and skills, could guide Naruto. Naruto, in turn, could show Itachi his unwavering spirit, which might even inspire Itachi in some ways.
Naruto's character development in this fanfiction scenario would be multi - faceted. Firstly, his relationship with Itachi would be a major factor. He'd respect Itachi more and perhaps see him as a mentor. As he trains in the Sharingan, he'd learn discipline in a new way, different from his training with Jiraiya. His interactions with other characters, especially those who are wary of the Sharingan's power, would change. He might have to prove that he can use this power for good. His growth would not only be in terms of combat skills but also in his maturity and how he views the ninja world as a whole.
Well, it could start with a simple moment of curiosity. Naruto, being the friendly and outgoing kid, might be attracted to baby Itachi's calm and somewhat mysterious presence. They could start by sharing simple things like toys or food. As time goes on, Naruto's determination and positive attitude could inspire Itachi, and Itachi's intelligence and calmness could influence Naruto in return.
At first, they might be cautious around each other. Naruto is used to the serious and stoic Itachi he knew, and now this female version is different. But as they face challenges together, like fighting against powerful enemies, they start to trust each other more. Their relationship could develop into a deep friendship where they rely on each other's strengths.
Their relationship would likely start with mutual respect. Naruto already respected Itachi after learning of his sacrifice. Once they join in the fanfiction, they would gradually become friends. They'd rely on each other in battles, and Itachi might start to see Naruto as a younger brother figure, much like Sasuke. Naruto, on the other hand, would look up to Itachi's skills and wisdom.
Their relationship could start with curiosity. Naruto might be intrigued by Female Itachi's calm and mysterious demeanor. Itachi, on the other hand, could see Naruto's determination and be drawn to it. As time passes, they start to trust each other more, sharing their dreams and fears.