A prevalent theme is secrecy. They might have to keep their vampire identities hidden from the outside world, and this secrecy can create a lot of tension and drama in the fanfic. Also, the idea of a forbidden love is quite common. Vampires are often seen as 'other' in these stories, and their relationship might be frowned upon by society in the fanfic world.
There's a fanfic titled 'Cosima and Delphine's New Beginning' that focuses on their fresh start after overcoming many obstacles. It details their daily life, how they support each other in their respective scientific pursuits while also nurturing their relationship. It's a really heartwarming read as it shows the strength of their bond.
You can try fanfiction.net. There are often a lot of fanfics in different categories, and it's likely to have some great Cosima and Delphine vampire fanfics. Another option is Archive of Our Own (AO3). It has a large and diverse collection of fan works, and you might be able to discover some interesting ones there.
Another place to check could be Tumblr. There are often fanfic recs (recommendations) on Tumblr blogs dedicated to the show that features Cosima and Delphine. Sometimes, you can also find short fanfics directly posted on Tumblr.
One common theme is competition. Since it's related to GP, there's often a focus on races and vying for victory. Another theme is friendship. Cosima might form strong bonds with other characters in the fanfic. And self - discovery is also quite common as Cosima figures out her place in the GP world.
One great Cosima and Delphine fanfiction is 'The Science of Us'. It delves deep into their relationship, exploring how they navigate the scientific challenges in the Orphan Black world while also dealing with their feelings for each other. Another is 'Healing Hearts' which focuses on Delphine helping Cosima recover from her illness in a very tender way. And 'A New Beginning' where they start a new chapter of their lives together, away from all the chaos of the clone drama.
Well, writing an Orphan Black Cosima and Delphine fanfiction isn't that easy but it's fun. You should start with an idea. Maybe it's a story about how they first met from Delphine's perspective. Then, develop the characters. Cosima is intelligent and curious, and Delphine is often conflicted between her duties and her feelings. Create a plot that tests their relationship. It could be a conflict with another clone or a scientific discovery that has ethical implications. As you write, use their mannerisms. Cosima might fiddle with her glasses when she's thinking, and Delphine might speak with a certain accent. Keep the story flowing and make sure the ending is satisfying.
Love and romance often feature prominently. Writers may explore the budding feelings between the reader and Belle Delphine, with sweet moments of affection and sometimes challenges to their relationship.
One common theme is love and relationships. Buffy has a complex love life, and fanfics often explore her relationships with Angel, Spike, and other characters in more depth. For example, some fanfics might focus on the what - ifs of her relationships, like what if Buffy had chosen Spike over Angel.
One common theme is power struggle. Since vampires often have special powers in these fanfics, Naruto, who already has his own ninja powers, has to deal with the new power dynamics. For example, he might have to learn to control his vampire strength without losing his identity as a ninja.
One common theme is the forbidden love. Since vampires are often seen as different and dangerous, a relationship with a human or another vampire of the same sex goes against the norms in the fictional world. Another theme is immortality. The vampire's immortality affects the relationship as the human or other non - immortal partner has to deal with the idea of their loved one living forever while they age.