There is also the theme of discovery. The c'tan discovers new aspects of the universe or itself. This could be related to emotions it didn't know it had, or new powers that it unlocks in a benevolent way. It might then use these new things to help others, which is different from its traditional portrayal as a purely destructive force.
You can try looking on some popular fanfiction websites like Archive of Our Own. There are often a wide variety of fanfics about different topics, and you might be able to find some great benevolent c'tan fanfic there.
If 'c clown' is a music group perhaps, and 'rome' is a fictional place, common themes might include the journey of the group in 'rome', like their experiences with the local culture, or how they overcome challenges there. It could also involve themes of self - discovery as they interact with this new environment.
One common theme is the underdog story. Writers often portray C9 as the team that has to fight against all odds. For example, they might be facing much stronger opponents in a tournament but still manage to pull off an unexpected victory.
The theme of self - discovery also pops up a lot. Saya is constantly evolving in the 'Blood C' universe, and in fanfics, her relationship with Fumito can be a catalyst for her to learn more about herself. For example, she might discover new aspects of her powers or her true purpose through her interactions with Fumito.
Friendship is a common theme. They might explore how Choi Young Do and Kim Tan's friendship develops or changes over time.
A major theme is also the transformation of characters. Pitch, who may be seen as a certain type of character initially, often changes due to this new - found love. For the reader, they also grow as they navigate this relationship. Additionally, the theme of destiny or fate is often present, as if they were meant to meet and fall in love at first sight.
A prevalent theme is the stigma associated with Hep C. People often feel ashamed or are afraid to tell others about their condition. Also, the unexpected ways of getting infected are common in these stories. For example, getting it from a seemingly normal medical procedure or from a relationship where the partner was unaware of their own infection. There is also the theme of hope and recovery, as many people do manage to overcome Hep C with proper treatment and support.
A common theme is friendship. Just like in the main series, Class 1C characters form bonds with each other. Fanfictions often explore how they support one another during training or when facing villains. Another theme is rivalry. They might compete with Class 1A or other classes in different events, which can lead to some intense and exciting storylines.
One common theme is the mother - daughter relationship. In many of her stories, she explores the complex dynamics between mothers and daughters, often with a focus on cultural differences. Another theme is the immigrant experience, showing how characters adjust to a new culture while still holding onto their own heritage.
Common themes might include kindness and courage. In many bedtime stories, the characters show kindness to others, which is an important value to teach children. And courage is also a great theme, like when a character faces their fears in the story. There could also be themes related to family, showing the love and support within a family unit.