One popular theme is mentorship. McGonagall being a mentor to Harry and guiding him through the challenges at Hogwarts. Another is the idea of family. Since Harry lacks a proper family, McGonagall can sometimes be portrayed as a mother - like figure. Also, there's the theme of Hogwarts itself. Fanfictions might explore their joint efforts to protect and uphold the values of Hogwarts during difficult times.
Her connection to the Gryffindor house is also a common theme. Some fanfics focus on her pride in the Gryffindor students and how she upholds the values of the house. She could be shown guiding Gryffindors through tough challenges and helping them grow into true Gryffindors.
Another theme is her loyalty to Dumbledore and Hogwarts. Fanfictions often explore how she stands by Hogwarts during tough times, like during the various attacks by Voldemort and his followers. For example, in many stories, she uses her powerful magic to protect the school and its students. She is a symbol of stability and strength within the Hogwarts walls.
Also, McGonagall represents a strong female character. In fanfiction, she can be the center of stories that deal with themes like loyalty, sacrifice, and leadership. Writers can show how she copes with difficult situations and how she uses her magic in creative ways, which is really appealing to readers.
One common theme is mentorship. McGonagall often acts as a mentor to Harry, guiding him through difficult situations and decisions, just like she did during his school years.
Another theme is wisdom. Since McGonagall is a very wise character, many fanfictions explore how she imparts her wisdom to others, especially Harry. They might have her giving advice on dealing with Voldemort or handling the pressures of being a young wizard in a dangerous time.
Since 'lemon' fanfictions involve inappropriate content, I can't really promote or discuss their themes. But in general, non - inappropriate fanfiction themes about Harry and McGonagall could include things like McGonagall's influence on Harry's academic progress at Hogwarts.
One common plotline is McGonagall protecting Harry from the Ministry of Magic when they wrongly suspect him of something. For instance, if the Ministry believes Harry is using Dark Magic, McGonagall stands up for him, using her influence and knowledge of Harry's character to prove his innocence.
Another reason is that the 'Harry Potter' universe is so vast. There are so many possibilities for stories centered around her. Fans love to imagine different scenarios where McGonagall is involved. It could be her taking part in a secret mission, or her having a different relationship with the Death Eaters. There's just so much room for creativity when it comes to writing about her.
Age - gap relationships can be a theme in some of these fanfictions. Since McGonagall is an older character, sometimes the stories explore a relationship with a younger or older partner. Also, the theme of forbidden love often comes up. The wizarding world has its own rules and hierarchies, and a relationship might go against those. In addition, the exploration of her past and how it affects her present - day relationships is a frequent theme.
One common theme is mentorship. Minerva often acts as a mentor to Harry, guiding him through his studies and the challenges he faces at Hogwarts. For example, in many fanfictions, she helps him with advanced magic classes.