Well, a frequently seen theme is the role of familiars in character development. In these fanfictions, familiars can act as guides or sources of strength for the characters. Also, the idea of dark and light magic is often explored. The Grimm elements can introduce some darker, more fairy - tale - like magic, which contrasts with the more defined light and dark magic in Harry Potter. And sometimes, there's a theme of discovery, like characters discovering new aspects of the magical world through their familiars.
Yes, there are quite a few. You can start by looking on fanfiction websites like Archive of Our Own. There, you'll find a variety of stories that blend the elements of Harry Potter and Grimm's Fairy Tales with the concept of familiars. Some might focus on a particular character having a unique familiar inspired by Grimm, while others could be more about the overall magical world with these combined elements.
One common theme is mystery. Since the Grim is often associated with death in the original Harry Potter series, when it's a familiar, it adds an air of mystery. Another theme is loyalty. The familiar - Grim relationship with Harry usually involves a deep sense of loyalty, much like how Harry's friends are loyal to him.
One common theme is the idea of an outsider or different type of magic. Since a Cerberus as a familiar is not a common concept in the original Harry Potter series, it often represents Harry or another character being different. For example, they might be shunned by some for having such an unusual familiar.
Well, magic exploration is a big one. Since pixies have their own kind of magic, fanfictions often show the wizard learning from the pixie about different types of magic. Also, loyalty. The pixie is usually depicted as being very loyal to its wizard. For example, in some stories, the pixie will go to great lengths to protect the wizard from danger. It's also common to see themes related to the discovery of hidden powers, either in the pixie or in the wizard as a result of their connection.
One common theme is the bond between Harry and his familiar. It's often portrayed as a very strong and almost telepathic connection.
The magic system in Harry Potter can be blended with Grimm's use of magic in its tales. In Grimm, magic is often more wild and unpredictable. In a fanfiction, Hogwarts could start to experience a shift in its magic due to an influx of Grimm - like magic. Spells could start to misfire in strange ways, like turning into animals from Grimm tales instead of the intended effect. This would force the students and teachers to adapt to this new, more chaotic magic, while also trying to keep Hogwarts safe from the threats that come with it, both from Voldemort's side and from the Grimm - inspired magical anomalies.
Another theme is power and growth. The familiar usually has some special powers or abilities that help Harry in his journey. Through their relationship, Harry also gains new skills and knowledge, which is a major part of these fanfics. For example, in some fanfics, the familiar might be able to communicate with ancient magical creatures, and Harry learns from this ability.
One common theme is the exploration of relationships. For example, romantic relationships between characters that were not fully explored in the original books, like the relationship between Harry and Hermione. Another theme is the expansion of the magical world, such as new spells or magical creatures. Also, there are fanfictions that focus on the backstories of minor characters, giving them more depth and significance.
Love and sacrifice are also prevalent themes. We see how the love of Lily Potter saved Harry in the original series, and fanfiction often expands on this idea of love being a powerful force. There are also fanfictions that explore the idea of redemption for characters like Draco Malfoy, showing that even those on the wrong side can have a chance at changing and making amends.
One common theme is adventure. Combining the action - packed world of 007 with the magical adventures of Harry Potter makes for some thrilling stories.