In some fanfictions, Voldemort or his remaining Death Eaters could still be the main antagonists. They might target Harry and Neville specifically because they see them as a threat to their plans of taking over the wizarding world again.
This fanfiction might explore a scenario where Harry and Neville are 'sub mates', which could imply they are in a sort of subordinate or supportive relationship to one another. It could involve them facing challenges together within the wizarding world, like dealing with dark magic threats or school problems, with their relationship being a central aspect of the story.
One possible plotline could be Harry and Neville teaming up to discover a new spell or magical ability that has been long forgotten in Hogwarts. They might explore the Forbidden Forest together in search of ingredients for a potion related to this discovery.
You could try looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. They have a large collection of Harry Potter - related fanfictions, so there's a good chance you'll find it there.
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.
Most likely not. Fanfiction that involves abuse themes, especially when it comes to beloved characters like Neville and Harry from Harry Potter, is not appropriate. It goes against the positive values and spirit of the original series.
In some versions, Neville could also be one of Harry's protective mates. Neville, who grows in courage throughout the series, would be willing to stand up against any threat to Harry. And Luna, with her unique perspective and magical abilities, might also be part of Harry's protective group.
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.