One possible theme could be redemption. Severus Snape is a character known for his complex and somewhat tragic backstory in the 'Harry Potter' universe. In a crossover with 'Madoka Magica', his story of redemption could be intertwined with the magical girl themes of sacrifice and hope from 'Madoka Magica'.
Another theme might be the struggle between good and evil. 'Madoka Magica' has its own take on the nature of good and evil within the magical girl concept, and Severus Snape is constantly in a gray area between good and evil in his own story. Combining these two could lead to some interesting explorations of moral ambiguity.
Well, you can start by looking on some popular fan fiction websites like Archive of Our Own. There might be some interesting stories that combine the elements of 'Madoka Magica' and Severus Snape. Just search for the relevant tags on the site.
A major theme in 'madoka magica fan fiction' is the exploration of the cost of wishes. In the original series, the wishes had heavy consequences, and fan fictions often take this concept further. They might show different wishes and how they affect not only the wisher but also the whole magical girl system. Also, the theme of redemption is quite common. Characters like Homura may be given more chances to atone for their actions in fan fictions.
Another theme is time - related. Since Homura has the ability to manipulate time in the show, many fanfictions play with this concept in relation to her relationship with Madoka. For example, stories might involve Homura going back in time to save Madoka in different ways or dealing with the consequences of her time - traveling on their relationship.
One common theme is self - discovery. The OCs often have to figure out who they are in the context of the Madoka Magica world, which is full of complex rules and moral gray areas.
One common theme is the exploration of different power systems. For example, when crossing over with other magical girl shows, how the magic in Madoka Magica compares and interacts with the other's magic system. Another theme is the clash of different worldviews. Characters from Madoka Magica, who often face a rather bleak reality, meet characters from more optimistic universes, and this creates a lot of interesting conflict and growth opportunities.
One great 'madoka magica fan fiction' is 'The Alternate Wish'. It explores a different scenario where Madoka makes a unique wish that changes the entire dynamic of the magical girl world. Another interesting one is 'Kyubey's True Intentions Revealed' which delves deeper into the motives of Kyubey.
Writing or discussing sex - related fan fiction is inappropriate and goes against ethical and moral standards, so I cannot provide relevant content.
One common theme is friendship. They start as comrades in the rather dark world of Madoka Magica, and many fanfictions explore how that friendship can develop into something deeper. Another theme is redemption. Both characters have their own flaws and past mistakes, and fanfictions often show them finding solace and growth in each other.
One popular trope is the 'time - loop fix - it' where Homura uses her time - looping abilities to try and create a perfect situation for Madoka. This often involves Homura going through multiple loops, each time learning more about Madoka and how to protect her better.
Well, in 'madoka magica side story', it shows more about the hidden secrets in the world of magical girls. For example, it might focus on a particular magical girl's struggle that wasn't fully explored in the main story. It could also introduce new magical elements or enemies that the girls have to face, which adds more depth to the overall story.