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.
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.
One common theme in such fanfiction could be the origin of the pregnancy. It could be a natural occurrence within a relationship, or perhaps something more extraordinary, like an alien or magical influence. This would then lead to different story arcs, such as how she copes with the changes in her powers or her public image as a pregnant superhero.
In Supergirl fanfiction, a pregnancy involving Winn and Kara can be a very interesting plot device. It could bring out different aspects of their characters. For example, Winn might show his more protective side. However, in the official storylines, there's no such plot, so fanfiction gives writers the freedom to explore this uncharted territory.
One common trope is the 'fish out of water' situation. Since they come from different universes, Supergirl might be confused by the more gritty and street - level problems in Spiderman's world, like petty crime. Another is the 'power couple' idea, where they are seen as a strong duo, both physically and in terms of their abilities.
Some Supergirl hurt fanfictions revolve around her getting injured in alternate universes. For instance, in a universe where the laws of physics are slightly different, she might not be as invulnerable as in the main DC universe. This can lead to interesting plotlines where she has to adapt to her newfound vulnerability. Also, fanfictions might explore the idea of her getting hurt because of a betrayal from someone she trusts. This adds a layer of psychological hurt along with the physical one.
In Cal and Mare pregnancy fanfiction, the 'medical drama' trope can be present. There could be complications during the pregnancy that require special care or attention. The 'name - choosing' trope is also common, as Cal and Mare debate over what to name their child. Additionally, the 'prophecy related to the child' trope might be used, adding an element of mystery and importance to the unborn baby.
One popular trope is the power - up trope. For example, Harry might gain new and powerful magic abilities through his interactions with the members of the harem. Another is the friendship - evolution - into - more trope. His friendships with the characters in the harem gradually develop into deeper, more complex relationships. For instance, in some fanfics, Hermione might start as just a friend but then develop romantic feelings over time.
One popular trope is the 'enemies - to - lovers' situation. Roommates start off not getting along, constantly bickering over things like who ate the last of the food or who didn't clean up. But as time passes, they gradually see the good in each other and fall in love. Another is the 'secret identity' trope. For example, one roommate could be a famous artist or writer but is keeping it a secret from the other, and the story unfolds as the secret is slowly revealed. There's also the 'roommate as a guardian angel' trope where one roommate unknowingly protects and looks out for the other in various ways.
Well, the 'enemies to lovers' can be found in some Spashley fanfiction too. They might start out bickering or having some sort of conflict, but then as the story progresses, they fall in love. Also, the 'secret relationship' trope is quite appealing. They keep their relationship hidden from others for various reasons, like fear of judgment or ruining their friendship in the eyes of others.
One popular trope is the 'powerless to powerful' arc. The main character, often an ordinary person at first, discovers they have latent superpowers and has to learn to control them. Another is the 'enemies to allies' trope, where two superheroes or a superhero and a supervillain start off as foes but end up working together. And the 'secret identity revealed' trope always adds a lot of drama as the character's normal life is disrupted when their superhero identity becomes known.