One plot idea could be that Supergirl has a secret mission that Chrom accidentally stumbles upon. This leads to them having to work together, initially reluctantly, but then they discover they have complementary skills. For example, Supergirl's superpowers and Chrom's strategic thinking. As they face various challenges together, they form a strong bond.
A plot could revolve around a secret organization that is after Supergirl. Chrom gets involved when he realizes that the organization's actions could have far - reaching consequences for his world as well. They have to go into hiding, relying on each other's abilities. Supergirl uses her super strength and flight to keep them out of harm's way, while Chrom uses his knowledge of the local terrain and his combat skills. As they share their stories and fears, a deep connection forms between them.
To write their character interaction, start with showing their initial differences. Supergirl is from a world of superpowers and Chrom from a more medieval - style world perhaps. Have them misunderstand each other's motives at first. For example, Supergirl's quick actions might seem rash to Chrom, and Chrom's more methodical approach might seem slow to Supergirl.
One plot idea could be that Supergirl and Batgirl team up to take on a new super - villain in Gotham. This villain has the ability to manipulate technology and is causing chaos. They combine Supergirl's super strength and flight with Batgirl's detective skills and martial arts expertise. Another idea is that they are transported to an alternate dimension where they have to find a way back home while facing different versions of their friends and foes. And a third idea could be that a powerful alien artifact is found in Metropolis and both girls must protect it from various forces that want to use it for evil, all while learning more about each other's worlds and abilities.
One idea could be that the male self - insert (SI) has a unique power that complements Supergirl's. For example, he might have the ability to control technology, and together they fight against a cyber - villain who is trying to take over the city's power grid. Another plot could involve the male SI coming from a different dimension and having to adjust to the world of Supergirl while also helping her deal with an otherworldly threat that she's not familiar with. A third plot could be that the male SI is an ordinary human at first but gains powers through an accident and then he and Supergirl have to learn to work together as he masters his new abilities.
One plot idea could be how they handle ruling a kingdom together after getting married. There could be political challenges and how they support each other through it. For example, dealing with rival kingdoms or internal disputes.
One possible plot idea could be a story of friendship. Fe and Chrom are friends, and they meet Olivia. Maybe they all go on an adventure together, exploring a magical forest. Along the way, they face challenges like difficult terrains and mythical creatures. They learn to rely on each other's strengths, with Fe's courage, Chrom's strategic thinking, and Olivia's charm and grace getting them through tough situations.
A plot could involve a time - travel scenario where Batman and Supergirl are sent back in time to prevent a major event that would change the future of both their worlds. They would have to work together, using their different skills and knowledge of their respective eras.
One idea could be a dark Supergirl who is corrupted by a powerful, evil force from outer space. She starts using her powers for her own gain, causing chaos in Metropolis. Another could be a Supergirl who has lost faith in humanity due to some great betrayal and turns to a darker path to 'teach' humans a lesson. And a third idea might be a Supergirl from an alternate, darker universe where her powers are more unstable and she has to constantly battle her inner demons.
Perhaps in the fanfiction, Supergirl is drawn to the Naruto world because of a strange energy signal similar to Kryptonite. Once there, she teams up with Sasuke who is initially distrustful but comes to respect her. They go on a quest to find the source of this energy. Along the way, Supergirl discovers that the energy is actually a by - product of an ancient and powerful jutsu. This jutsu was sealed away long ago, and now it's starting to leak, threatening both the Naruto world and potentially Supergirl's home planet if it spreads.
Another plot could be set in an alternate universe where Supergirl lands in a world that has no concept of superheroes. She has to learn how to fit in while also trying to figure out how to use her powers without causing chaos. The fanfiction could explore her journey of self - discovery in this new world.
Well, there could be a plot where Lex Luthor's daughter has some latent powers that are awakened by Supergirl in a moment of crisis. This newfound power makes her a target for other villains, and Supergirl feels responsible for protecting her. As they spend more time together, they start to understand each other's perspectives. Maybe the daughter has a different view of the world than her father, and Supergirl helps her explore and embrace that, leading to a story of self - discovery and an unexpected bond between them.