There are quite a few fanfics where this happens. One popular one is 'The Mystic Visions of Harry' where his divination experiences lead to unexpected adventures.
I know of a fanfic called 'Harry's Secret Sight' where Harry has a significant vision in divination that changes the course of the story. The author weaves an interesting plot around it.
In the fanfic, Harry's vision in Divination class could be about a future event involving one of his classmates. For example, he might see Neville getting into a dangerous situation with some magical plants in the greenhouse. Harry then decides to keep an eye on Neville and prevent the situation from happening. This could also lead to a sub - plot where Neville starts to suspect that Harry knows something about his future and there's some tension between them until Harry finally reveals what he saw in his vision and they work together to avoid the danger.
A great fanfic in this category is 'Visionary Harry in Divination'. Here, Harry's ability to have visions in divination sets him apart from his classmates. His visions are often a blend of symbolic and literal elements. For example, he might see a phoenix in his vision which could symbolize rebirth or a great change in the wizarding world. As he tries to understand these visions, he forms new alliances and uncovers long - lost spells and knowledge that could change the course of the wizarding war.
It could strengthen his relationship with Hermione. Since Hermione is always interested in knowledge and research, when Harry has this vision, she would be eager to help him figure out what it means. They would spend more time together in the library, looking through old Divination books and other magical texts. This shared experience would bring them closer.
It could be a magical fantasy fanfic where Harry's vision reveals a hidden secret or a future event that sets off an adventure.
The plot could be that Harry starts to have extremely vivid and accurate prophetic dreams, much more so than what he had in the original series. He uses these dreams to foresee danger not only for himself but for the whole wizarding world. For example, he might predict an upcoming dark wizard attack on Hogwarts much earlier and be able to prepare defenses. His newfound divination skills make him a key figure in the fight against dark forces.
In the fanfic, it's possible that Harry's experiences throughout his adventures at Hogwarts contributed to his success in Divination. All the strange and mysterious things he had encountered before might have given him an edge. He could have used his knowledge of magic in general and applied it to the divination exam in a unique way.
It might be a fantasy fanfic where the vision in Twelaney's class is a key event that connects to a larger magical conspiracy or prophecy.
One reason could be that he's desperate for any form of guidance. After all the chaos he's been through, divination might seem like a way to get some answers about the future. It's like grasping at straws, but it could be important to him.
Yes, he does. In many fanfics, Harry might take divination seriously as it could offer him new insights or ways to deal with the challenges he faces. It could also be a way for him to explore a different aspect of magic that he didn't fully appreciate in the original story.
One popular fanfic idea could be exploring the backstory of the Divination teacher. Maybe she had a hidden past as a powerful seer in a different wizarding community before coming to Hogwarts. This could add depth to her character.