A more dramatic title could be 'Forbidden Love: Female Vampire and Human Male' which emphasizes the unconventional nature of their relationship.
How about 'The Female Vampire's Allure for the Human Male'? It gives a sense of the attraction between them.
One great female vampire x human fanfiction is 'Eternal Embrace'. It tells the story of a young human who falls in love with a mysterious female vampire. The story is filled with romantic moments and the struggle between their different natures.
One idea could be a story where a human boy discovers a lost female Digimon in the real world. He decides to help her find her way back to the Digital World while they form a strong bond. As they face various challenges together, their relationship deepens into a unique friendship with a touch of unspoken feelings.
One idea could be that the male OC is a new student at the school. He has a special ability that he tries to hide at first. But as he gets to know the characters from Rosario Vampire, he gradually reveals it. For example, he might be able to control shadows and uses this power to help his new friends in a dangerous situation.
Definitely the power dynamics. The female vampire is likely to be more powerful physically and perhaps even in terms of social status in the vampire world. The human male may seem weak in comparison at first. But then, he could bring out the softer side of the vampire, like teaching her about human emotions. There could also be a conflict with other vampires who don't approve of the relationship, adding more drama to the story.
One common theme is the struggle between different natures. The female vampire has her vampiric instincts like the need for blood, while the male human is mortal and has a different set of values. Another theme is the forbidden love aspect. Their relationship often goes against the norms of society, whether it's the vampire society or the human one. It adds an element of excitement and danger.
How about 'The Encounter of Sephiroth and His Male OC Counterpart: A Fanfiction'. This title gives an idea that the story might be about how Sephiroth meets the male OC and what kind of relationship or interactions they will have. It also clearly states that it is a fanfiction which can attract the right audience who are interested in this particular pairing.
One possible title could be 'Sebastian and the Female Reader: An Unforgettable Encounter'. This title gives a sense of mystery and the idea that there is something special between Sebastian and the female reader. It's simple yet effective in drawing the reader's attention.
How about 'The Love Story of Yuuri and Female Wolfram'? It's simple and straightforward, clearly indicating the main characters and the genre of the fanfiction.
One possible title could be 'The Encounter: Female Wolfman and the OC'.
Some possible titles could be 'Female Ichigo's Encounter with Grimmjow', 'The Bond Between Female Ichigo and Grimmjow', 'Female Ichigo and Grimmjow: An Unlikely Pair'.