It's possible that Naruto gives Itachi a custom - made kunai. Naruto knows Itachi is a great ninja, and a special kunai could be a practical and meaningful gift. It could be engraved with some words of respect or friendship.
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.
Another gift Naruto could give Itachi is a book about the recent history of Konoha. Itachi sacrificed a lot for the village, and he might be interested in knowing how the village has changed and developed during his absence.
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.
The duck could symbolize peace or friendship. Maybe Naruto gives it to Itachi as a sign of truce or new - found understanding between them.
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.
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.
In Naruto fanfiction, an interesting gift could be a custom - made kunai with the recipient's name engraved on it. It's not only a useful weapon in the Naruto world but also a very personalized item.
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.
Itachi could have realized Naruto's potential and determination. He knows Naruto is different from other ninjas and has a unique ability to change people's hearts. By giving Naruto his Sharingan, Itachi might be ensuring that Naruto has the power to carry out some important mission or to protect the people Itachi cares about.
One possible plot implication is that it could create a rift between Naruto and some of the shinobi in the village. Since the Sharingan is an Uchiha - specific power, some might be suspicious of Naruto having it. Another is that it could lead to Naruto being targeted by those who want the Sharingan for themselves.
I'm not sure about a specific one off - hand, but you can check out fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for 'Itachi gives Naruto power' and you'll likely find a bunch of different stories. Some might focus more on the action aspect, while others might explore the emotional side of Itachi's decision to give Naruto power.
In a 'Naruto marries Itachi' fanfiction, the plot might start with an alternate reality where Itachi never joined the Akatsuki. He and Naruto meet during their training days and form a strong bond. As they grow older, they realize their feelings are more than just friendship. They have to overcome the differences in their clans and the expectations of the village. Their marriage could then be a symbol of unity, and they might work together to face new threats to the shinobi world, all while dealing with the challenges of their relationship in a world that doesn't always accept their love.