Well, these fanfictions are captivating as they allow for a rewrite of the Naruto story. With time travel, Naruto can fix his past mistakes, like not being trained properly earlier. It also gives a chance to explore different relationships. For instance, how he could have befriended certain characters sooner. Moreover, it's exciting to see how his actions in the past can reshape the entire Naruto universe, creating new storylines and character developments.
One interesting 'Naruto Neglected Time Travel' fanfiction could be 'Naruto: Time Warp Redemption'. In this fic, Naruto travels back in time and uses his future knowledge to correct the mistakes of the past. Another one might be 'Back to the Beginning: Naruto's Time Travel'. It often focuses on Naruto's relationships and how they change when he gets a second chance. There's also 'Naruto's Time - Traveling to Save All' which has Naruto trying to prevent future disasters by changing the past.
One common plotline is that Naruto uses his knowledge from the future to gain power quickly in the past. For example, he might already know some powerful jutsu and train himself to master them earlier. Another is that he tries to make his family notice him and regret their previous neglect. He could also change the course of events in the village to make it a better place sooner.
Well, when it comes to Naruto time travel and Rinnegan in fanfics, it's often about exploring new storylines. Maybe Naruto himself gets the Rinnegan and travels back in time to train his younger self. This would make him a much more powerful ninja at an earlier stage and could completely change the power balance in the Hidden Leaf Village and among the other ninja villages as well.
Perhaps he's been influenced by someone who gives him bad advice. For example, if someone tells him that natural talent is enough and training is overrated. Also, he could be dealing with some personal problems, like a conflict within his family or among his friends that takes up all his time and mental energy, causing him to neglect training.
He might start to rely on his friends more. For example, Sasuke and Sakura could become his main source of emotional support. He would focus on training with them and sharing his feelings, which in turn helps him to grow stronger and more independent.
In Naruto, the Jinchuuriki were often treated poorly. In fanfiction, this neglect can be explored in many ways. One common approach is to focus on the emotional and psychological impact on the Jinchuuriki. For example, they might feel isolated from the rest of the village due to the fear and prejudice associated with the tailed beasts within them. This can lead to some really interesting character development stories in fanfiction.
In a fanfiction, perhaps neglected Naruto runs away from Konoha and ends up in the same area as Yugito. Yugito, having also faced her own share of hardships, takes Naruto under her wing. They bond over their experiences, and Yugito helps Naruto to better understand his chakra nature by sharing her knowledge of the tailed beasts' chakra. This could lead to Naruto developing new abilities and a newfound confidence.
One reason could be that some fanfiction authors might focus more on other aspects like new jutsu or character relationships outside of the Uchiha clan. They may not fully understand the potential of Sharingan, which has a wide range of abilities from basic perception enhancement to powerful genjutsu. Another factor could be the over - popularity of some other elements in the Naruto universe, like the tailed beasts, which overshadow the Sharingan in their stories.
It might be explored through lack of training or guidance. Since he's godlike, the village might think he doesn't need any help. So, they neglect his development in terms of combat strategies or new jutsu, leaving him to figure things out on his own.