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.
The main characters in 'madoka magica side story' are those we are familiar with from the main series. Madoka is a key character, and her actions and decisions have a huge impact on the story. Homura, with her unwavering dedication to Madoka, is also very important. Sayaka, who struggles with her ideals as a magical girl, and Kyouko, with her own set of beliefs, are likely to be main characters as well. Their individual stories and how they interact with each other form the core of the side story.
Madoka Kaname is one of the main characters. She is a kind - hearted girl who gets drawn into the world of magical girls. Homura Akemi is also important. She has a complex relationship with Madoka and her actions are often driven by her desire to protect Madoka.
Madoka and Tsubasa are the central characters. Madoka's character is likely to bring a sense of hope and determination to the story. Tsubasa may add an element of mystery or unpredictability. Together, they form the core of the 'madoka and tsubasa lemon fanfiction', and the events in the story usually revolve around their relationship and their individual growth.
Well, Madoka herself is likely still a main character. Homura too, as their relationship is a central part of the original and would probably be explored differently here.
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.
Another possibility is Kyosuke. In the original story, Madoka had some feelings for him. In this fanfiction, they could explore a deeper romantic connection, perhaps with some twists and turns that are different from the original plot.
I'm not sure about the 'best' but there are many talented authors. Some authors who have a deep understanding of the characters and write engaging stories are often popular. You can check on fanfiction platforms like FanFiction.net or Archive of Our Own to find authors with high ratings for their Gingka and Madoka fanfictions.