One interesting storyline could be Kara adjusting to life on Earth as a young girl. Maybe she's trying to hide her powers while also making friends at school. Another could be her learning about her Kryptonian heritage in a more personal way, like finding a hidden family heirloom that gives her new insights.
A really engaging storyline could be Kara dealing with the loss of her home planet in a more in - depth way as a young girl. She might have nightmares about Krypton's destruction and has to learn how to cope with that grief while still being a normal girl on Earth. This could lead to her using her pain as motivation to become a better hero, protecting Earth so that no one else has to experience what she did.
Well, obviously Kara herself is a common character. Then there's often her adoptive family, like the Danvers. Alex Danvers, her sister, is frequently in these fanfictions. They usually have a strong bond that's explored further. Also, Clark Kent might make an appearance. Since he's also from Krypton, he can act as a mentor or a source of information for Kara about their home planet.
Some fanfictions might focus on the father of the baby. If it's Mon - El, there could be a lot of drama as they navigate their relationship in this new phase. It could also show Kara learning about motherhood and how her powers might be affected during pregnancy.
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.
The new perspectives. An OC (original character) can bring in fresh ideas and storylines. For instance, an OC could have a unique power that changes the dynamics in the Supergirl world.
One idea could be Kara struggling with her dark side as she is exposed to a new form of kryptonite. This kryptonite doesn't just weaken her physically but also affects her mental state, making her more aggressive and less likely to follow her usual moral code. Another plot could involve Dark Kara teaming up with an unexpected villain from another universe, creating chaos across multiple dimensions. And perhaps she starts to question her own identity, whether she is truly the hero she thought she was or if this new dark self is her real nature.
One interesting storyline could be them teaming up to face a powerful new villain that neither of them can defeat alone. They combine Robin's strategic mind and Supergirl's super strength to outwit the enemy.
One interesting storyline could be Superboy and Supergirl teaming up to face a new and powerful villain that the Justice League has overlooked. They might discover a hidden threat in Smallville that has ties to Krypton's past.
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.
One interesting concept could be a story about Kara and Alex's early days of training together. How Alex helped Kara control her powers and how they developed a bond during those intense training sessions. Another concept could be a time - travel story where they go back in time to change an event that had a major impact on their lives or the city they protect.
Supergirl fanfiction often focuses on various aspects of the characters' relationships and adventures. However, creating or seeking adult - themed fanfiction may not be in line with the positive and family - friendly nature of the Supergirl franchise. It's better to look for general fanfiction that emphasizes their sisterly bond, heroic deeds, and character development.