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.
Definitely Harry Potter. He has that connection to the muggle world through his aunt and uncle, so it's easy to write him in muggles meet wizards scenarios. Ron Weasley is also popular as he can provide some comic relief when dealing with muggles. New characters created specifically for the fanfiction can also gain popularity. For example, a muggle girl who has an uncanny ability to sense magic even though she's not a wizard. She can be a central figure in the story, and fans start to love her character as she bridges the two worlds.
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 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.
Some of the most popular original characters are those who are related to the main characters in unexpected ways. For instance, a long - lost relative of Harry Potter who shows up during the war with some crucial information or powers. There are also original characters who are healers with extraordinary skills, as they play an important role in treating the wounded during the war, and fans love to read about them.
In Harry Potter fanfiction, the relationship between Muggles and Wizards can be complex. Sometimes, Wizards see Muggles as inferior, as they lack magical abilities. However, some fanfictions show Wizards protecting Muggles from dark magic. For example, a wizard might secretly use magic to prevent a Muggle accident. There are also fanfictions where Muggles discover the wizarding world and have to adapt to it, which often leads to interesting cultural clashes.
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.
Well, in some fanfictions, the Ministry of Magic might step in and use memory charms to erase the muggles' knowledge. This is to keep the wizarding world a secret as it has always been.
Papyrus also shows up often. His relationship with Sans adds an interesting dynamic to the crossovers. And his own unique personality and abilities can lead to various plot developments when combined with other crossover elements.
Alex Russo is definitely a popular choice. She's the main character with a sassy and adventurous personality. Her misadventures in using magic and trying to balance her normal life with her wizard life offer a lot of material for fanfiction. Writers can explore her relationships with her family, friends, and love interests more deeply.
In some fanfictions, muggles might find out about wizards through accidental magic incidents that are too big to be covered up. For example, a large-scale magical battle in a Muggle - populated area could expose the existence of wizards.