One idea could be muggles discovering a powerful magical artifact and trying to use it against wizards. Another could be wizards trying to hide their world from muggles who have become overly curious due to some strange magical events leaking into the muggle world. A third plot idea might be a group of muggles and wizards teaming up against a common enemy that threatens both their worlds.
Well, in some muggles vs wizards war fanfiction, there could be a situation where muggles develop technology that can counteract magic to some extent. This would lead to a very different kind of war. Or perhaps a wizard decides to side with the muggles and teaches them magic in secret, which causes a huge rift among the wizarding community. Also, the idea of muggles unknowingly being used as pawns by a dark wizard against the wizarding world can make for an exciting plot.
There are several common characters. For example, Newt Scamander could be involved as he has a deep understanding of magical creatures and how they could be used in a war. Ginny Weasley might also be a character, as she is a strong witch. On the muggle side, a journalist who discovers the wizarding world and tries to expose it, which in turn sparks the war, could be a common character in these fanfictions.
In such fanfiction, Muggles can be shown in different lights. Some portray them as simple and uncomplicated, living their ordinary lives without any knowledge of magic. However, there are also fanfictions where Muggles are more curious or even a bit envious of the magical abilities of Wizards. They might be depicted as trying to find out about the wizarding world despite the secrecy.
One interesting plotline could be a muggle accidentally stumbling into the wizarding world and having to learn the ropes quickly. For example, they might find themselves in Diagon Alley and be completely bewildered by all the magical shops and strange creatures. Another could be a wizard falling in love with a muggle and trying to keep their magical identity a secret while still building a relationship. And a third could be muggles being recruited to help with a wizarding problem that only their unique muggle skills can solve.
One idea could be that Harry is under a dark spell that makes him kidnap Muggles, but then his friends try to break the spell and save him and the Muggles. Another could be that it's a case of mistaken identity and Harry is wrongly accused of kidnapping Muggles when he was actually trying to protect them from a real threat. Maybe in the fanfiction, Harry kidnaps Muggles to show the wizarding world how wrongly Muggles are treated by some wizards.
One idea could be a wizard from a forgotten lineage emerging to challenge the established order in the wizarding world. Maybe he discovers an ancient magic that was thought to be lost.
In a 'The Wizards of the Black Circle Fanfiction', a great plot could be that a mysterious artifact surfaces that has the power to either destroy or transform the Black Circle. The wizards must search for clues about its origin and purpose. Along the way, they face internal conflicts as some believe it should be used for power while others think it should be destroyed. Additionally, you could write about a time - travel plot where the wizards are sent back to their early days, and they have the chance to change their fates and avoid becoming part of the Black Circle, but at what cost?
You could create a plot where a group of students from different backgrounds have to team up to face a new threat that the academy faculty is unaware of. This would allow for character development as they learn to work together and also introduce new magical elements or creatures that are specific to this new threat.
One idea could be a time - travel plot. For example, the Russo kids could accidentally travel back to the era when their parents first met and get involved in the events that led to their parents' relationship. This would add a lot of humor and drama as they try not to mess up the past but still end up causing some chaos.
Maybe a crossover with a post - apocalyptic world. The Sky Wizards have to use their flying skills and magic to survive in a desolate land filled with new and dangerous threats. They could also team up with the local survivors who have their own unique abilities.
One idea could be a story where the gay wizard has to hide his identity from his non - magical family while also dealing with the pressures of wizard school. Another could be a love story between two gay wizards from different magical families, facing the challenges of their families' rivalries.