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.
In Madoka x Homura fanfiction, the power dynamics between them can be an interesting aspect. Madoka, as a very powerful magical girl, and Homura, with her time - looping abilities, have a unique relationship. Fanfiction could play with how they use their powers in relation to each other. Maybe in a fan - created scenario, they combine their powers to save a new threat that wasn't in the original series.
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'.
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.
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 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.
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.
It's mainly because fan art often involves visual reinterpretation and can sometimes fall under fair use, while fan fiction typically involves extensive use of the original story and characters, which might infringe on copyright more easily.