It could be that some of the neglected characters from Naruto, like Rock Lee for instance, are made main characters in this fanfiction and are paired with a Gremory character. Maybe a Gremory character who also has been somewhat overlooked in their own series. This would give a new perspective and new storylines to explore.
Well, in such a fanfiction, the interesting part could be the unique crossovers. Maybe it combines the Naruto universe's ninja skills with the Gremory's magical elements in a really unexpected way. It might also explore new character relationships that we don't see in the original works.
The plot might involve Naruto being shunned by the Gremory family or their associates. This could lead to Naruto having to find his own path. He could encounter other outcasts or those who also feel neglected. Together, they might form an alliance to change the perception of the Gremory family towards them or to simply make a place for themselves in this world that seems to not want them.
There could be members of the Gremory family. For example, Rias Gremory might be a key character. She could be one of those who initially neglect Naruto but later come to realize his potential. Another character could be Issei Hyodo, who might be in a position where he has to choose between the traditional Gremory way and Naruto's different approach.
One good 'OC Gremory Neglected' fanfiction could be 'The Lost Gremory'. It focuses on an OC in the Gremory family who has been overlooked and their journey to find their place. Another might be 'Gremory's Forgotten One' which delves into the emotions of the neglected OC as they face various challenges within the family dynamic.
Some niche fanfiction communities or forums dedicated to the relevant fandom might also be a good source. Members often share their own fanfictions or recommend ones they've read. For example, if there's a specific forum for the series that the Gremory concept is from, check there for any 'OC Gremory Neglected' fanfictions.
One idea could be a crossover where Naruto's world is merged with the one that Gremory and Gabriel exist in. Naruto, with his strong will and ninja skills, could form an alliance with Gremory, who might be from a noble demon family, and Gabriel, an angel. They could fight against a common enemy that threatens both their realms, like a powerful dark force that wants to disrupt the balance between the ninja world, the demon world, and the angelic realm.
Well, it could be due to their different personalities. Naruto is all about hard work and loyalty to his friends in his own universe. Rias Gremory has a more complex and sometimes manipulative personality in her story. In fanfiction, the writer might want to create a conflict by making Naruto dislike her, perhaps because he sees her methods as being at odds with his own values.
In 'naruto gremory fanfiction', we get to see the characters from Naruto in a new light. For example, seeing Naruto interact with the Gremory family members and navigate their world. It also allows for new power combinations and character growth. Naruto might learn new abilities from the Gremory world and vice versa, which makes the stories full of surprises and fresh ideas.
In this fanfiction, the plot could also center around Naruto trying to understand the Gremory family's history and secrets. As he delves deeper, he discovers things that could change the future of the family. He might also have to deal with enemies from both the Naruto universe and the Gremory universe who are out to stop him from becoming a successful heir. He would need to use his quick thinking and combat skills to protect himself and the family.