A common trope is the 'enemies to lovers' arc. At first, Lena might be a bit suspicious of Kara or vice versa, especially considering Lena's family history and Kara's secret identity. But as the story progresses, they see past their initial differences and fall in love. Also, the 'love triangle' trope can be found, although not as often. Maybe there's a third character who has feelings for either Lena or Kara, which adds some drama and tension to the relationship. And the 'found family' aspect is important too. Their relationship is not just about romantic love but also about building a family - a support system where they can be themselves and rely on each other.
In Kara and Lena vampire fanfiction, a common trope is the power struggle. Vampires usually have superhuman powers. So, if Kara is a vampire, she might struggle with controlling her new powers, and Lena could be the one to help her. Another trope is the immortality factor. If Lena is a human in the story, the idea of Kara's immortality creates a sense of longing and melancholy. And of course, the 'blood bond' trope where the sharing of blood between them has a special significance.
In fanfiction, when Kara and Lena are married, we can expect a lot of fluff. There will be scenes of them cuddling on the couch, sharing sweet nothings. Their marriage could also mean more united front against villains. They would be each other's strength and support, making them a formidable pair.
Archive of Our Own (AO3) is a great place to start. It has a vast collection of Supergirl fanfictions, including many where Lena loves Kara. The site has a good tagging system, so you can easily filter for the specific relationship and other elements you like. Fanfiction.net is also an option, although the interface might be a bit less user - friendly compared to AO3. You can also check out some Supergirl - focused fan communities on platforms like Tumblr. Often, users there will recommend their favorite fanfictions, and you might find some real gems.
There might be a fanfiction where Kara's identity as Supergirl is revealed in a way that hurts her deeply, and Lena, despite their past differences, stands by her side. It could explore their complex relationship and how they deal with the fallout together.
One popular Kara and Lena fanfiction could be 'A New Beginning'. It focuses on their relationship evolving in a post - apocalyptic world. They have to rely on each other and in the process, their bond deepens.
In many fanfictions, when Kara meets Lena, a plotline could be that they are both at an event and Kara's super - hearing picks up on Lena's distress. Kara helps her out, and this starts their relationship. There are also plotlines where they are pitted against each other at first, perhaps because of misunderstandings about their motives. But as they get to know each other better, they realize they are on the same side and form a strong alliance. This alliance can then be the basis for many adventures and emotional moments in the fanfiction.
In fanfiction, when Kara meets Lena, they might immediately become friends. Kara's superpowers could intrigue Lena, and Lena's intelligence might impress Kara. They could start collaborating on projects to help the city.
A common theme is friendship. Many stories focus on how Supergirl and Lena Luthor can overcome their differences and form a deep bond. For example, they might start as rivals but gradually become friends as they face challenges together.
Well, if Kara gets hurt, Lena might become more protective of her. She could start to be more involved in Supergirl's battles, not just as a scientist providing tech support but as someone who is truly invested in Kara's safety. This would make their relationship closer and more interdependent.
One more trope could be the 'pregnancy as a catalyst for growth'. The experience of pregnancy makes Supergirl re - evaluate her life, her purpose as a superhero, and her relationships. It forces her to become more mature and make different choices, which can lead to some very interesting character development in the fanfiction.