One interesting plotline could be the exploration of the relationship between the main character and the elves. Maybe the main character discovers a hidden power among the elves that could change the wizarding world. For example, they might find a way to use elf magic in a new way that no one has thought of before.
One interesting plotline could be an elf - led rebellion against the unfair treatment of house - elves. They might organize secretly and try to gain equal rights within the wizarding society. Another could be an elf who discovers a long - lost magic that has the power to change the balance between the magical and non - magical worlds, and the main characters from the Harry Potter series have to decide whether to support or oppose the elf.
One interesting plotline could be the main character's struggle to fit in Slytherin while still holding onto some of the values Harry Potter himself represents. Maybe they're trying to change the perception of Slytherin from within.
One interesting plotline could be how Harry's view of the wizarding world changes. Since elves have a different culture, he might see things like house - elf slavery in a new light. He could grow up with a more empathetic view towards the underprivileged in the wizarding society.
One possible plotline could be that the Potter elves teach Harry unique magic that is different from what he would learn at Hogwarts. For example, they might show him ancient elf magic that gives him an edge in dealing with dark forces. Another could be that the elves raise Harry with a strong sense of family and loyalty, which makes him more empathetic towards those who are often overlooked in the wizarding world, like house - elves themselves.
In some 'Harry Potter raised by elves fanfiction', a possible plotline is that the elves teach Harry their language and ancient magic. This gives him an edge in his later adventures as he can access magic that other wizards don't know. Also, the elves' strong sense of loyalty and family could influence Harry, making him more empathetic towards those who are often overlooked in the wizarding society, like the house - elves themselves.
One interesting plotline could be the exploration of the 'Dark Prince' character's backstory. Maybe they have a complex family history that led them to their dark path. Another could be the unique magical abilities the Dark Prince has that set them apart from other characters in the Harry Potter universe.
Well, perhaps in 'the king harry potter fanfic', there's a plotline where Harry discovers a long - lost magical artifact that gives him the power and status of a king. This could lead to him having to face off against old enemies who now see him as an even greater threat. And his friends from Hogwarts might have to band together to protect him as he adjusts to this new role. Also, it could involve new magical creatures being drawn to him because of his new - found king - like aura.
Since this is an improper concept for the Harry Potter world, there are no so - called 'good' plotlines in such fanfic. We should uphold the positive values that J.K. Rowling intended in the original work, rather than exploring such unseemly fan - created ideas.
Perhaps in the fanfic, Harry is turned into a snake for a period of time. As a snake, he experiences the wizarding world from a different perspective. He has to learn how to survive as a snake while still trying to fulfill his role in the fight against Voldemort. He might encounter other snakes that are either friendly or hostile, and he has to use his wits to deal with them.
A great plotline in some fanfics is the discovery of new spells and magic. It could be that a long - lost spellbook is found, and the characters start to experiment with spells that are more powerful and dangerous than what they are used to. This could lead to all sorts of situations, from accidentally creating new magical disasters to using these spells to fight off new, unexpected enemies.