Another theme could be growth. They might show how Michael and Freddo grow as individuals while being in each other's lives. For example, they could learn important life lessons from each other. This theme allows for character development and makes the story more engaging.
One popular 'michael x freddo fanfic' might be 'The Unlikely Bond'. It focuses on their friendship development in a unique setting.
Another theme is the power struggle. Michael and Lucifer are both powerful beings, and in fanfics, this often plays out. They might compete for power at first, but then realize that there are more important things than power, like their connection. It makes for a very engaging dynamic in the stories.
In Selene x Michael fanfics, the theme of adventure is quite common. They could be on a journey to save their world or a particular place that is important to them. Along the way, their relationship deepens. Also, the theme of redemption can be seen, where one or both of them have made mistakes in the past and their relationship helps them find a way to redeem themselves.
Friendship is a very common theme. Most fanfics explore how Jeremy and Michael are there for each other, like in 'Jeremy and Michael: The True Friends' where they always have each other's backs.
One common theme is friendship turning into love. Often, the reader starts as a friend or acquaintance of Michael and over time, their relationship deepens into something more romantic.
Another theme is redemption. Some fanfics explore whether the reader can somehow bring out a different side of Michael, like a more human side. For example, in some stories, the reader's presence might make Michael question his violent ways.
Adventure themes might also be present. For example, they could be on a quest together in a fictional world, and during that adventure, their relationship deepens. This adds an exciting element to the story.
Common themes include survival. Since Laurie is constantly trying to survive Michael's attacks in the original movies, fanfics might expand on this. Also, there's the theme of obsession. Michael is obsessed with Laurie in a way, and fanfics can explore this further, like what if Laurie becomes equally obsessed with stopping Michael or understanding his motives. There's also the theme of redemption in some cases, where maybe Michael could be redeemed through his connection with Laurie, though that's a very different take on the classic horror relationship.
A common theme is the exploration of Michael's inhumanity. His relentless pursuit of victims is often a central focus. Another theme is fear. Fanfics play up the terror that Michael instills in the characters. Also, there's the theme of mystery, as his motives are often left ambiguous in the original movies and fanfics try to fill in those blanks.
Since I haven't read a lot of lilypichu x michael fanfiction, it's hard to say for sure. However, some possible themes could be growth, both personal and in their relationship. Maybe there are stories about how they overcome challenges together, or how they discover new things about each other. Another theme could be the power of their connection, whether it's a platonic or a romantic one in the fanfiction world.