The duck could symbolize peace or friendship. Maybe Naruto gives it to Itachi as a sign of truce or new - found understanding between them.
Perhaps the duck has some special meaning within the context of the fanfiction's unique plot. It could be a magical duck that has powers to heal or reveal secrets. Naruto, sensing Itachi's need for something (maybe emotional or physical healing), gives him the duck as a form of assistance.
He could be touched. Despite his stoic exterior, Itachi may see this as a genuine and innocent gesture from Naruto, and it could warm his heart in some way. Maybe he starts to see Naruto in a new light, as someone who can bring a bit of light - heartedness into his world of shadows.
In the fanfiction, it could also be a way to bridge the gap between their two clans. Naruto, as someone who wants to bring peace to the ninja world, giving gifts to Itachi can be seen as an attempt to heal the old wounds between the Uchiha clan and the rest of Konoha.
Naruto might give Itachi some traditional Konoha food as a gift. Since Itachi has been away from the village for a long time, he might miss the taste of home.
One possible fanfiction could be that Itachi, on his deathbed, decides to transfer his Sharingan to Naruto. He sees in Naruto the potential to change the Uchiha's fate and the ninja world. Naruto, with the Sharingan, gains new abilities like enhanced perception and the ability to copy some jutsus more easily. He uses this new power to better understand the Uchiha and bridge the gap between them and the rest of the village.
A simple plot could be that Itachi entrusts Naruto with his Sharingan because he believes Naruto can use it to bring peace to the ninja world. Naruto, being the kind - hearted person he is, accepts the responsibility. He starts training with Kakashi to understand and master the Sharingan's powers. With the Sharingan, Naruto can anticipate his opponents' moves better and uses this advantage in battles against powerful enemies like Pain.
Maybe Itachi saw Naruto as a potential force for good in the ninja world. He might have thought that giving Naruto the Sharingan would make him strong enough to protect the village and bring peace.
Well, the plot could start with Itachi realizing that Naruto is the key to the future of Konoha and the ninja world. So, he gives Naruto his Sharingan. Naruto then has to deal with the new power. He might start having visions related to Itachi's past, which could help him understand the Uchiha - Senju conflict better. And this new knowledge could influence his decisions in future battles and political situations in the ninja world.
One possible scenario in such a fanfic could be that Itachi, seeing Naruto's potential and his pure heart, decides to entrust Naruto with his Sharingan. This could potentially give Naruto new abilities and a deeper understanding of the Uchiha clan's power. It might also create a unique bond between Naruto and the memory of Itachi, leading to new storylines where Naruto uses the Sharingan's powers in unexpected ways.
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.
Well, in fanfiction, the significance of Kurenai and Itachi is often enhanced. In the original Naruto, their roles are somewhat defined within the broader narrative. However, fanfiction allows for a different take. It can focus on their unexploited potential as characters. For example, their shared knowledge of genjutsu could be a starting point for a completely new story arc in fanfiction. Also, their personalities can be tweaked or explored more fully, like exploring Itachi's more human side in relation to Kurenai, which gives a fresh perspective compared to the original.