One idea could be that Harry discovers a new and powerful form of magic that was long forgotten. He then has to learn to control it while also hiding it from those who might misuse it.
Another plot idea could be that Harry is forced to take on the role of a magic master earlier than expected due to a sudden threat to the wizarding world. He has to quickly gather allies, both old and new, and use his skills in ways he never thought possible to defeat this new evil.
Another plot idea could be that Harry, as a master of magic, has to go back in time to correct some mistakes in the past that are now causing problems in the present. This would involve him facing his younger self and trying to guide his actions without disrupting the timeline too much. He would need to use his advanced magical skills to avoid detection and make the necessary changes.
One idea could be that Harry discovers he has a unique magical ability that even Dumbledore doesn't know about. This ability could be related to his connection with the very essence of magic. For example, he might be able to communicate with magical creatures in a way no one else can, which leads him to uncover secrets about Hogwarts' past.
One idea could be that Harry, as the Master of Death, uses his new - found power to travel through different magical realms to learn ancient magic. He could meet long - lost magical creatures and gain their knowledge. Another plot could involve him using his power to bring back some of the good characters who died in the war, like Sirius or Lupin, but with unforeseen consequences that he has to deal with.
One idea could be exploring the inner workings of the Ministry from the perspective of a new, young employee. They could discover some dark secrets hidden within the various departments.
You could also focus on the Weasley - Potter family relations in a fanfic. For instance, how the two families' magic combined in different ways. Maybe there are some spells that only work when a Potter and a Weasley work together, and exploring those spells and the situations where they are used can make for a great fanfic story.
One interesting idea could be the exploration of new magical spells. In many fanfictions, authors create unique spells that add a fresh dimension to the wizarding world. For example, a spell that can transform objects into living creatures temporarily. Another idea might be alternative interpretations of the relationships between characters. Some fanfictions might depict a closer bond between Harry and Snape, showing a side of Snape that was not fully explored in the original series. Also, the concept of a new magical school in the fanfiction can be really exciting, with different teaching methods and a whole new set of magical rules.
One idea could be exploring how Harry uses his newfound status as the Master of Death to bring back some of the characters who were lost in the war, like Sirius or Lupin. He could then form a new kind of magical order with them to safeguard the wizarding world in a different way.
One idea could be to explore the lives of minor characters in the Harry Potter universe. For example, you could write about the backstory of Neville Longbottom's parents before they were tortured into insanity. Another idea is to create a new magical creature and describe its interaction with the known wizarding world. Maybe a creature that lives in the Forbidden Forest and has a special connection to the trees there.
Well, perhaps the 'arrow magic fanfic' could involve an ancient prophecy related to the arrows. A young hero is chosen to wield these magical arrows and must use them to defeat an evil sorcerer who is threatening the land. The arrows might have different magical abilities based on their fletching or the type of wood they are made from. For instance, arrows with eagle feathers could have the power of flight for a short time.
One idea could be a character discovers a hidden magic within themselves that is connected to Aphmau's world. For example, they might find out they can control a special type of magic like shadow magic which is rare in the Aphmau universe. This could lead to a journey of self - discovery as they try to master it while also facing challenges from those who fear this new power.