In the fanfiction, Kara Lemon could be an original character created by the author. She might be a muggle - born witch who discovers her powers later in life and is then thrust into the magical world of Harry Potter.
One possible scenario in such a fanfiction could be that Kara gets physically hurt during a fight against a powerful enemy while Lena is desperately trying to find a way to save her. Maybe Lena uses her scientific knowledge to develop a new device that can heal Kara's injuries. This would show the deep bond between them as Lena risks everything to save Kara.
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.
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.
Another idea is Kara getting separated from Alice and Connor during their journey to freedom. She then has to rely on her own wits and the kindness of some humans she meets along the way. This could lead to her having to make difficult decisions, like whether to trust a human who seems friendly but might be leading her into a trap. It would be a great exploration of her character's growth and her ability to adapt in tough situations.
One idea could be a story where Barry, Kara and Oliver team up to face a powerful new villain that none of them could defeat alone. They have to learn to combine their powers and skills in a unique way.
In fanfiction, if Kara and Cat are pregnant, it could be a story of new beginnings. Maybe they'll form a support group of sorts just between the two of them, sharing stories of their cravings and morning sickness. Their pregnancies could be a way to show their vulnerability and strength at the same time.
In a Kara and Cat pregnant fanfiction, their pregnancies could bring out different sides of their characters. Kara, perhaps, would be super - protective and use her powers in unique ways to safeguard her unborn child. Cat, on the other hand, might be more business - like at first, trying to plan everything out perfectly, but then softening as the pregnancy progresses and she realizes the unpredictability of it all.
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.
Let her make mistakes. Kara could trust the wrong human who ends up betraying her and the other androids she's with. This setback could make her more cautious and also more determined. She would learn from this experience and become more street - smart. Her character arc would then be about not just her growth in terms of her ideals, but also in her practical skills and judgment in a world that is often hostile to androids.