Some fanfictions might focus on Draco Malfoy's internal struggle during Harry's sixth year. He was under a lot of pressure to carry out Voldemort's tasks. In the fanfiction, we could see more of his emotions and how he might have considered changing sides. He could be secretly helping Harry in some small ways without the Death Eaters knowing.
Another plot could revolve around Harry's Occlumency lessons. In fanfiction, it could be that instead of just trying to block his mind from Voldemort, he actually manages to use Occlumency to his advantage. He could start to plant false thoughts in Voldemort's mind through their connection, leading Voldemort astray in his plans.
Some fanfictions in Harry Potter Year 8 focus on the characters dealing with the aftermath of the war. For example, Neville could be working on a project to bring back some of the plants that were destroyed during the battle. This not only helps to heal the physical damage but also serves as a symbol of the wizarding world's recovery. It also gives Neville a chance to shine in a different way than he did during the war.
A new character could be a foreign exchange student from a far - off wizarding school. This student could bring with them unique magical abilities that are not commonly seen at Hogwarts. For instance, they might be able to control the elements in a way that is different from any known Hogwarts magic. They could also have a different perspective on the fight against Voldemort, which could influence Harry and his friends.
Often, a plotline in 'Harry Potter's sixth year harem fanfiction' is the introduction of new characters into the harem. Maybe a foreign exchange student arrives at Hogwarts and catches Harry's eye, adding to the existing group of love interests. Or perhaps a character who was previously just a friend starts to develop deeper feelings for Harry, leading to a shift in the dynamics of the harem. There can also be plotlines centered around secrets within the harem. For instance, one of the girls in the harem might be hiding a connection to the Dark Arts, which Harry has to uncover while still maintaining the relationships.
One interesting plot could be about Harry forming an unexpected alliance with some Slytherin students during his 5th year. They might team up to uncover a mystery within Hogwarts that involves a dark magic item that was planted there by Death Eaters. This could lead to a lot of character development as they learn to trust each other despite their house differences.
Some fanfics in 'harry potter eighth year' might focus on the characters' growth in terms of their magical abilities. Harry, for instance, could be exploring new spells or forms of magic that were previously unheard of. There could also be a plot where the students are trying to rewrite the rules of Hogwarts, to make it more inclusive and modern, which would lead to a lot of conflict and resolution within the school community.
Harry Potter himself is still very popular. Fans often like to put him in new situations or relationships in fanfiction. For example, exploring his growth as a wizard and a leader during his sixth year in different ways than in the original story.
In some Harry Potter 8 fanfictions, there are plots where the characters continue to face new dark magic threats. For example, a new dark wizard might emerge, and Harry, Hermione and Ron have to use their combined skills and knowledge to defeat this new foe. Another plot could be about the exploration of the wizarding world's past in more depth, revealing secrets that were previously unknown.
Hermione Granger is a very likely character to be part of Harry's harem. She has been Harry's close friend throughout his years at Hogwarts and in fanfiction, it's easy to imagine their relationship taking a more romantic turn. Ginny Weasley is another possibility. She already has a romantic connection with Harry in the original series, so she could be a key part of the harem. Luna Lovegood could also be included. Her unique personality and magical insights might attract Harry, and she could bring a different flavor to the harem dynamic.
One interesting plot could be about the Potter family's hidden secrets being unearthed. Maybe there are ancient spells or prophecies related to them that no one knew before. Another could be a story where the Potter family has to face a new and powerful dark force that is specifically targeting them due to their legacy. And a third plot might involve time - traveling within the Potter family's history to correct past mistakes or learn from them.