I'm not sure about a specific 'itachi x hinata x sasuke fanfic' to recommend. You could try searching on fanfiction websites like Archive of Our Own. They usually have a wide variety of fanfics, and you might be able to find one that involves this particular pairing.
One challenge could be Sasuke's aggression. Since he is in a nightmare state, he might be extremely violent and not recognize Hinata as a friend. Hinata would have to be very careful not to get hurt while still trying to reach out to him.
One interesting Sasuke x Hinata Madara fanfic is 'The Unlikely Bond'. It explores a unique scenario where Sasuke, Hinata and Madara are brought together in a complex plot. The characters' personalities are well - written and the story has a good flow.
Another great one is 'Shared Destiny'. This fanfic focuses on how Hinata and Sasuke's destinies become intertwined. It starts with a small encounter that gradually grows into a significant relationship, with well - written character development and an engaging narrative.
One common theme is the idea of two very different personalities coming together. Sasuke is often portrayed as brooding and aloof, while Hinata is shy and gentle. Their relationship development as they overcome these differences is a popular theme.
One highly regarded hinata x sasuke fanfic might be 'The Unlikely Bond' (assuming it exists). It could be great because it might explore their relationship in a unique way, perhaps showing how Hinata's gentle nature contrasts and complements Sasuke's brooding personality.
First, understand the characters well. Naruto is the energetic and determined hero, Sasuke is the brooding and powerful rival - turned - ally, and Hinata is the shy yet strong - willed kunoichi. Then, create a unique plot. It could be a time - travel plot, where they go back in time to change certain events. Make sure to show their individual growth and how their relationships develop. For example, Hinata could start to be more assertive around Sasuke and Naruto as the story progresses.
Love triangles also appear quite often. Given Hinata's feelings for Naruto and the complex relationship between Naruto and Sasuke, writers play around with the idea of how these relationships can develop in different ways, adding a touch of romance and drama to the stories.
I really like 'The Trio's Destiny'. It starts with a strange event that binds Naruto, Hinata, and Sasuke together. As the story progresses, their individual goals start to blend with their newfound connection. It shows how their different personalities can either clash or complement each other in a really interesting way.
One common theme is friendship. Despite the love triangle aspect that might be present, many fanfictions explore how Naruto, Hinata, and Sasuke can still be friends and support each other. Another theme is unrequited love. It could be that Hinata's love for Naruto is not fully reciprocated in the way she hopes, or there could be some feelings between Sasuke and Hinata that are unspoken. And of course, there's the theme of redemption. Sasuke's character often has a journey of redemption in these stories, and Naruto and Hinata play roles in that process.