It's possible that she was cursed and made to disappear by someone who was jealous of her achievements at Hogwarts. Her disappearance would then cause chaos among her friends, especially Harry and Ron, who would drop everything to look for her. They might start by retracing her last steps, asking other students if they saw anything strange, and using spells like 'Homenum Revelio' to try and detect her presence.
Maybe she stumbled upon a dangerous magical secret and was trapped in a hidden place while trying to figure it out. For example, she might have found an ancient spell that backfired and sent her to an unknown dimension. In this situation, her friends would have to search through various magical texts and seek help from wise magical creatures to find her.
She could have been kidnapped by dark wizards who want to use her intelligence for their evil plans.
Voldemort's remaining Death Eaters could be behind it. They might see Hermione as a threat to their attempts to regain power in the wizarding world.
In this fanfiction, it might be that Percy goes missing because he is on a self - imposed mission. He could be trying to protect his friends from a danger he discovers, and he doesn't want to involve them, so he disappears without a trace. He might be in a far - off land, facing challenges all alone.
Another plot could be that Naruto goes missing because he's on a self - imposed exile. He might feel that he's putting his friends and the village in danger due to some new power he discovers within himself that he can't control. So, he decides to disappear to protect everyone.
One possibility could be that Hermione uses her magic skills in Forks in unexpected ways. Maybe she helps the local people solve some strange problems that they can't figure out with normal means. For example, she could use a spell to find a lost item in the forest which is full of mystery in Forks.
One possible plot could be that Hermione goes to Beauxbatons as part of an exchange program. She might struggle to adapt to the different culture and teaching methods there. For example, the focus on charm and elegance in Beauxbatons might be quite different from Hogwarts' more practical approach. She could also make new friends who introduce her to different kinds of magic that are more common in the Beauxbatons curriculum.
One possible plot could be Hermione being selected for an exchange program to Durmstrang. There, she might face challenges in adjusting to their different teaching methods which are more focused on the Dark Arts in a controlled way compared to Hogwarts. She could also encounter new friendships and rivalries. For example, she might become friends with some students who are secretly opposed to the more extreme elements in Durmstrang's curriculum.
One possible plot could be that Hermione discovers a dark secret about Azkaban. And the Ministry of Magic, fearing she'll expose it, sends her there. In Azkaban, she meets some other wrongly imprisoned witches and wizards. Together, they plan an escape while also trying to expose the real criminals in the wizarding world.
The plot could involve Hermione trying to reform the St Trinians' school. She sees all the chaos and unruliness there and decides to use her Gryffindor courage and Ravenclaw intelligence to bring some order. Along the way, she has to deal with the unique personalities of the St Trinians girls, who are not used to the strict Hogwarts - like discipline she tries to introduce.
Well, perhaps the plot could involve Hermione facing challenges in a male - dominated military school environment. She might use her intelligence to outwit bullies and excel in military tactics and training.
It could be that there's a magical curse that causes him to vanish. His wife, being a strong - willed character, decides to study all she can about the curse. She teams up with some powerful wizards and witches in the wizarding community. As she delves deeper into the mystery, she uncovers secrets about Harry's family that she never knew before, which may be the key to finding him.