One interesting Mary MacDonald fanfiction could be where she plays a key role in uncovering a hidden mystery within Hogwarts. Maybe she discovers a secret passage that has been long forgotten and it leads to some sort of ancient magic or a hidden treasure. Another could be a story where she forms an unexpected alliance with other minor characters to fight against a new dark threat in the wizarding world.
A great Mary MacDonald fanfiction is one where she is the main character in a story about the development of new spells. She uses her intelligence and creativity to come up with unique magical incantations that change the way magic is used in Hogwarts. It's really exciting to see her character grow in this aspect.
In many fanfictions, Mary McDonald is often portrayed as a brave Gryffindor. She is usually shown as having a strong sense of justice, just like her housemates. For example, she might stand up to bullies in the corridors of Hogwarts.
It can have a mixed effect. On one hand, it can attract new fans who are interested in these new, idealized versions of the story. Some people enjoy reading about characters that are different from the originals. On the other hand, it can annoy some die - hard fans. They might feel that these Mary Sue characters distort the original world that J.K. Rowling created. For example, the power balance and the relationships between the original characters can be disrupted.
A Mary Sue in a Harry Potter fanfic often has overly perfect traits. For example, she might be extremely powerful in magic from the start, much more so than the original characters like Harry. She may also be adored by all the characters instantly without any real development of relationships. This can make the story less interesting as it doesn't follow the same rules of character growth and struggle that the original Harry Potter series had.
One possible plotline could be that Mary Jane somehow gets transported into the Harry Potter universe. She might be mistaken for a Muggle - born witch and have to adapt to life at Hogwarts. She could introduce some of her 'Spider - Man' world ideas, like courage in the face of danger, to the students there.
Magic is a very common theme. Since both 'Harry Potter' and 'Mary Poppins' are set in magical worlds, fanfictions often explore different types of magic. For example, how Mary Poppins' magic of tidying up and her flying umbrella might compare to the spells in 'Harry Potter'.
She could be a mysterious visitor. Maybe she'd show up during a difficult time at Hogwarts, like when Voldemort was causing chaos. Her positive attitude and magical abilities would surely have an impact. She might be able to cheer up the students and give them hope in the face of danger.
One way to blend them creatively could be by having Mary Poppins visit Hogwarts. Maybe she could use her magical nanny skills to teach the students some unique lessons, like how to clean up a potion spill with just a snap of her fingers. She could also interact with the magical creatures there, perhaps taming a hippogriff in her own special way.