Perhaps in the fanfiction, there's a theory that Harry has the ability to communicate with magical creatures in a way no one else can. Hermione reads this fan - created idea and believes it. So she arranges for Harry to be in situations where he can test this ability, like spending more time in the Forbidden Forest with different creatures.
In a story, it could be that there is a fanfiction about Harry having a connection to time - traveling magic that is different from the Time - Turner. Hermione believes this fan - written concept. She then helps Harry try to unlock this new form of time - traveling ability, thinking it could be the key to solving some of the mysteries in the wizarding world, like the origin of the Dark Arts or the true purpose of certain ancient spells.
One way could be that Hermione discovers a fan - written account of Harry being a descendant of an ancient and powerful wizarding family that was previously unknown. She believes in this story so much that she starts to research it further, looking for evidence in the Hogwarts library.
It could be developed by exploring the secret societies within the pureblood community. A fanfiction might tell a story about a hidden pureblood society that has its own rules and rituals. This society could have an impact on the main characters, like Harry Potter himself. Maybe they try to recruit him or oppose him based on his own blood status (even though he's a half - blood but has a powerful reputation). Also, it could show the internal power struggles within this society.
One way could be that Harry discovers he has the ability to heal others with his blood, like a 'blood god'. For instance, when someone is poisoned, his blood can act as an antidote. Another example could be that his blood has the power to control dark creatures, so he uses it to keep dementors at bay.
One way could be to create new jutsu that combine different elements in unique ways. For example, a jutsu that mixes water and lightning elements in a way not seen in the original Naruto. Another example is to have a character with an ability to control all elements at once, which is a big departure from the normal limits in the Naruto story.
One example could be if in the fanfiction Hermione suddenly hates books and knowledge. In the original, her love for learning is a core part of her character. So that would make it seem like she's not really Hermione.
One way could be that Naruto simply stops talking to Sakura. He avoids her, doesn't engage in their usual banter, and focuses his attention on training instead. For instance, he starts training with Kakashi more often and doesn't invite Sakura along like he used to.
Well, it could start with small signs of Hermione's possessiveness. For instance, she might always choose to sit next to Harry in the Great Hall or during classes. As the story progresses, Harry could initially be oblivious to her possessive behavior, but then start to notice and question it. This would lead to some deep conversations between them about their relationship and Hermione's feelings.
Another example could be that Naruto decides to leave the village where Sakura lives to get away from her. He might feel that the only way to truly be done with her is to put some distance between them. As he leaves, he leaves a note for Sakura saying something like, 'I need to find myself without you in my life.' This could then lead to Sakura going on a journey to find Naruto and try to make amends, or Naruto could start a new life elsewhere and meet new characters, completely changing the direction of the fanfic.
At first, their relationship would be very strained due to the kidnapping. But as the story goes on, they could start to understand each other's motives. For example, if Harry was forced to kidnap her for a noble reason, Hermione might gradually forgive him. Their relationship could then develop into a deeper friendship with more mutual respect.
One way it could be portrayed is through her wardrobe. She might have elaborate gowns and jewels, like in some fanfictions where she attends grand balls as a princess. Another aspect could be her living quarters, which are opulent and filled with expensive furnishings.
There are fanfictions where Hermione loses her temper when she encounters unfair treatment towards house - elves. She might angrily confront those who she believes are exploiting them, her voice rising and her face getting red with rage.