Some possible titles could be 'Jasper and His Male OC: An Unlikely Bond', 'The Journey of Jasper Hale and His Male OC', 'Jasper Hale's Encounter with a Male OC'.
You could also go for titles like 'Male OC in Jasper Hale's World', which gives a sense of the OC being inserted into Jasper's existing universe. Another option is 'Jasper Hale and the Male OC: A New Chapter', emphasizing that their relationship is starting something new. 'The Male OC's Adventure with Jasper Hale' is also a good one as it focuses on the experience of the OC with Jasper.
The plot could be about the male OC being a new student in town where Jasper lives. They meet by chance, and at first, Jasper is a bit standoffish because of his vampire nature. But as time passes, they start to become friends and the OC helps Jasper deal with his thirst in new ways.
One idea could be a crossover where Jasper Hale, with his vampire abilities, senses Hermione's powerful magic. They meet when the Cullens move to the UK for some reason. Jasper is intrigued by Hermione's intelligence and her ability to handle complex situations. They start to form an unlikely friendship which gradually turns into a deeper relationship as they learn more about each other's worlds.
Love and relationships are also a big theme. Whether it's a romantic relationship between the OC and Jasper or a strong friendship, the interactions between them are central. The OC often brings out a different side of Jasper that we might not see in the original books.
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 common theme is the struggle of the oc to fit into the vampire world. Since Jasper has his own complex past in the Twilight series, the oc often has to navigate through the rules and hierarchies of the vampire society.
The integration with the existing Twilight lore is key. It should feel like it belongs in the Twilight world. This means getting the details right about the vampires, their powers, and the overall setting. If the fanfiction can add something new to the established world while still staying true to it, like exploring a different side of the vampire society through the eyes of Jasper's OC wife, it can be really great. And of course, character development not just for the OC but for Jasper as well. Seeing how he changes or is influenced by his relationship with the OC wife can make for a very engaging read.
How about 'Lucifer Morningstar and His Encounter with the Male OC: A Fanfiction'? This title gives a basic idea of what the fanfiction might be about, that is, an encounter between Lucifer and the male original character.
How about 'Daenerys Targaryen's Encounter with the Male OC'? This title is simple yet effective. It sets the stage for a story about their meeting and the events that unfold from there. It could lead to a story of love, friendship, or even enmity depending on how the author chooses to write it.
How about 'Newt Scamander and His Male OC Companion: A Magical Adventure'? It gives a sense of what the story might be about - their adventures together in the wizarding world.
One possible title could be 'Scarecrow and My OC: An Unlikely Bond'.