The theme of survival in a post - apocalyptic world is also prominent. With the world in chaos due to the conflict between different species, characters have to constantly fight for their own survival and the survival of their kind. This forces them to make difficult choices and face various challenges.
One of the main themes is the struggle between different species, like vampires and humans. There is also a theme of redemption, as some characters try to atone for their past actions.
Caterina Sforza is also a great character. She is a powerful and intelligent woman. Her political acumen and her ability to navigate the complex power - plays in the story are quite remarkable. She often uses her charm and wits to get what she wants.
One common theme is identity. OCs often struggle to find their place in the complex world of Trinity Blood, whether they're half - vampire, half - human or something else entirely. Another theme is power. They might be discovering new powers or trying to control existing ones.
There are fanfictions that focus on alternate endings. Maybe in one, Abel Nightroad doesn't sacrifice himself and instead finds a way to bring peace without such a great cost. This type of fanfiction allows fans to explore different possibilities within the Trinity Blood universe.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of Trinity Blood fanfictions, with different genres and themes. The search function on AO3 allows you to filter by various criteria like rating, length, and tags.
One idea could be a crossover with a popular fantasy series like 'The Lord of the Rings'. Imagine the characters from Trinity Blood in the Middle - earth setting, with vampires and other supernatural beings interacting with hobbits, elves, and humans. Another idea is a crossover with a superhero universe. The vampires in Trinity Blood having to face off against superheroes or even teaming up to fight a greater evil. For example, they could join forces with the Avengers.
Abel Nightroad would be a great character to feature. His complex personality, being a vampire but also having a strong sense of justice, would make for interesting interactions in a crossover. Also, Esther Blanchett. She is a strong - willed human who could hold her own in different crossover scenarios. For example, in a crossover with a magical world, she could learn new spells and use her intelligence to navigate the new situation.
One great Trinity Blood OC fanfiction is 'The Lost Heir'. It features an original character who discovers they have a hidden connection to the main plot's events. The character development in this fic is really well - done.