Yes, there are quite a few interesting ones. You can start by looking on fanfiction.net. Some of them explore how their relationship as brothers would change the story's dynamics, like in adventures at Hogwarts or during the fight against Voldemort.
One main theme is family. It shows how their brotherly bond can be a source of strength. Another is the impact on the wizarding war. Their combined efforts could change the outcome.
The popularity also comes from the fact that both Harry and Neville are well - loved characters. Combining them in fanfiction allows for new and exciting storylines. For example, they could go on adventures together that were not part of the main plot, or support each other in ways that are unique to their new relationship.
One great 'Harry Neville Brothers' fanfiction is 'The Bond Beyond Houses'. It explores their friendship in a post - Hogwarts world, showing how they support each other in rebuilding the wizarding community.
Sure. There are also fanfictions that delve into their family relationships. Maybe Draco has a change of heart and starts to see Harry and Neville as true brothers, and they all support each other through difficult times, like dealing with the aftermath of the war.
One common theme is redemption. Draco often has a chance to redeem himself and form a closer bond with Harry and Neville. Another theme is friendship across house divides. Since they are from different houses, their growing friendship is a popular plot point.
Another plot could be that Harry and Neville are actually long - lost twins separated at birth. They start having strange dreams about each other and then figure out the truth. This revelation would change their relationship and how they see themselves in the wizarding world. They could then team up to face a new, powerful dark force that is emerging, using their combined skills and the new - found bond between them.
I'm not sure specifically if there is a fanfiction titled exactly 'Harry is mad at Neville', but it's very possible. Fanfiction writers often play with different character dynamics. Neville is a character who has his own insecurities and growth throughout the series, and Harry also has his own emotional journey. A story where Harry is mad at Neville could explore their individual personalities and how they resolve their conflict.
Luna Lovegood could also be an interesting addition. Her unique perspective on magic and the wizarding world might bring new ideas to the group. For instance, she could have insights about some of the more mysterious magical creatures or phenomena that they come across, which could be crucial in their quests or battles.
In this fanfiction, Harry and Neville could support each other through all the challenges at Hogwarts. For example, Neville could help Harry with his Herbology studies, which Neville is quite good at. And Harry could give Neville confidence in facing his fears, like standing up to the bullies. Their friendship would be a source of strength for both of them.