Friendship is a very common theme. It shows how these three characters with different personalities support and grow with each other. Another theme could be rivalry, especially between Tamaki and the twins in a light - hearted way as they compete for attention or status in the host club.
In a yandere phobos x will fanfic, one aspect to consider is the power dynamic. If Phobos has more power, it can intensify his yandere tendencies. For example, he could use his influence to isolate Will. The fic might also focus on Will's reaction to Phobos' yandere behavior. Will could either be scared or, in an interesting twist, gradually come to understand and even accept Phobos in some way.
Look for fanfic communities dedicated to the source material that Phobos and Will are from. There, you can ask for recommendations of 'yandere phobos x will fanfic'. Members are usually quite helpful in sharing their favorite stories in this genre.
A common theme is their bond. Since they are friends in the original story, fanfics often explore how deep that bond can be. It could be a story about loyalty, where they are always there for each other no matter what.
The theme of loyalty also pops up often. They are shown to be extremely loyal to each other. In some fanfics, when one of them is in danger, the other will go to great lengths to protect them, no matter the cost, which really emphasizes the strength of their relationship.
One great place to find hikaru x tamaki x kaoru fanfiction is Archive of Our Own (AO3). There are various stories there with different themes. Some might focus on their friendship evolving in a unique way, while others could explore a more romantic angle among the three characters. Just search for their names on the site and you'll be presented with a selection of fanfics.
Another theme is growth. Fanfictions often show how both characters grow as individuals and as a pair. Tamaki might become more confident with Mirio's influence, and Mirio could also learn important lessons about himself through his relationship with Tamaki. It's all about their mutual development.
One great place to find tamaki x mirio fanfiction is Archive of Our Own (AO3). There are many well - written stories there. You can search for tags like 'tamaki x mirio' or 'Tamaki Amajiki' and 'Mirio Togata' to narrow down the results.
One popular 'yandere x kagome fanfic' is 'Obsessed Love'. It has an interesting plot where the yandere character shows extreme possessiveness towards Kagome in a rather unique Inuyasha - inspired setting.
The contrast in characters. Kagome is often portrayed as a strong - willed and kind character. When paired with a yandere, who has extreme and often dark emotions like obsessive love, it creates a very interesting dynamic. For example, in some fanfics, Kagome's attempts to understand the yandere's motives while maintaining her own values can be really captivating.