Perhaps the fanfiction could focus on the little sister's own journey of self - discovery. Growing up in the shadow of her two powerful brothers, she might strive to find her own identity and power. She could train secretly and then surprise everyone with her newfound abilities. And in the process, Sasuke and Itachi might have to deal with their own feelings about their sister growing up and becoming independent.
It could be a rogue ninja from their clan who has a vendetta against the Uchiha family in general. Since Sasuke and Itachi are already well - known, the antagonist might see the little sister as an easier target to get revenge on the Uchiha. He could try to kidnap her or harm her in some way.
One common theme is brotherly love. Itachi's love for Sasuke despite the hardships they face is often explored. For example, in many fanfictions, Itachi sacrifices a lot to protect Sasuke.
Love and friendship can also be themes. The sister might form deep friendships with other characters in the Naruto universe. And in some cases, there could be a romantic sub - plot for her. This could be with a character from her own clan or someone outside like a ninja from another village. These themes add different layers to the fanfiction and make it more engaging for readers.
In many fanfictions, Sasuke starts as a character full of anger and a thirst for revenge. But in the context of a relationship with Itachi, he begins to soften. He starts to see Itachi in a different light, beyond just the person who killed their clan. Itachi, on the other hand, is often portrayed as a complex figure with many secrets. In these fanfictions, his love for Sasuke makes him more vulnerable and human. For example, in some stories, he reveals his true motives to Sasuke, which changes their dynamic.
Sakura can also be a popular character in these fanfictions. She might be a friend to Sasuke's sister, or there could be some sort of rivalry or cooperation between them. Also, characters from other ninja clans might be involved, like Shikamaru. His intelligence could be used to help Sasuke's sister in strategic situations in the story.
One popular 'little Sasuke and Itachi fanfiction' is 'The Bond Beyond Blood'. It beautifully portrays the relationship between the two brothers at a young age. It shows Itachi's protective nature towards Sasuke and Sasuke's admiration for his older brother.
There are also fanfictions where Itachi's little sister has some unique abilities that play a role in the story. In some, she might be a key to resolving conflicts within the Uchiha clan. You can find such fanfictions on platforms like Fanfiction.net or Archive of Our Own by simply searching for 'itachi's little sister fanfiction'.
Well, 'Sasuke's Little Sister's Journey' is also a notable one. It follows the sister as she embarks on her own adventure separate from Sasuke. She meets new characters, faces her own enemies, and discovers more about herself and her place in the ninja world. It's really interesting to see her character develop independently.
Sasuke would likely become more protective. Usually Sasuke is very focused on revenge and his own power, but when faced with baby Itachi, he would feel the need to shield him from all harm. His cold exterior might soften a bit as he looks at the innocence of baby Itachi.