A plot could involve Kara Thrace being a distant relative of a wizard family in the Harry Potter world that was thought to be extinct. When she arrives, she is a mystery to everyone. Harry Potter is intrigued by her and her different ways. They start to exchange knowledge, Kara sharing her technological know - how from the Battlestar Galactica universe and Harry teaching her about magic. Together, they face a new dark wizard who is trying to combine magic and technology in a dangerous way.
One possible plot could be that Kara Thrace somehow ends up in the wizarding world of Harry Potter. Maybe she crashes her Viper into a magical portal. She then teams up with Harry Potter and his friends. With her combat skills and fearless nature, she helps them in their fight against Voldemort. For example, she could teach them some advanced combat maneuvers from her military training.
Maybe a rogue wizard who has found a way to access the technology from Kara's world and wants to use it to rule both the wizarding world and any other world he can reach. He would be opposed by both Harry Potter, who wants to protect his world, and Kara Thrace, who doesn't want her technology misused. This wizard could combine dark magic with advanced technology to create powerful and dangerous weapons and spells.
In this fanfiction, Kara could be from a different magical realm entirely. When she and Harry meet, it's like two different magical cultures colliding. Harry is used to the rules and traditions of the wizarding world in Britain, while Kara has her own set of customs. They first clash because of these differences but then gradually come to understand and respect each other. Their love story could involve them traveling between their two worlds, and finally they get married, uniting their two magical heritages in a grand ceremony at Hogwarts.
One possible plot could be that the Joker somehow finds his way into the wizarding world. He starts causing chaos in Hogwarts, and Harry Potter has to figure out a way to stop him without using the Killing Curse. Maybe the Joker uses his mind - games on the students and teachers, creating a lot of confusion and mistrust within the school.
One possible plot could be that a Dyson fan is brought into Hogwarts by a Muggle - born student. The fan starts to behave oddly in the magical environment, and the students and teachers have to figure out why. Maybe it's reacting to the magic in the air, and they discover that it has some sort of hidden magical property that no one expected.
One possible plot could be that a group of raptors escape from a magical zoo and end up in the Forbidden Forest. Harry and his friends discover them and have to figure out how to deal with these strange and dangerous creatures. Maybe they find out that the raptors are actually under a dark spell and they need to break it to send them back to their own world.
Well, it could start with Harry Potter somehow ending up in a different universe where he meets Kara (assuming it's a female character). Maybe through some magic portal or spell gone wrong. And in this new place, there's a harem concept where Kara is part of a group of female characters. Harry might initially be confused but then start to develop feelings for Kara and the other members of the harem over time. They could go on adventures together, facing challenges that are a mix of magic from Harry's world and whatever threats exist in Kara's world.
One possible plot could be that Harry and Kara are in a relationship. When Kara discovers she's pregnant, they face challenges together. Maybe they have to deal with the reactions of their friends and family, and they struggle to balance their own dreams and the upcoming arrival of the baby. For example, Harry might be on the verge of a big career opportunity, but he has to put it on hold to support Kara during her pregnancy.
One possible plot could be that Gibbs is called to Hogwarts to solve a mystery. Maybe a student has gone missing and Gibbs uses his investigative skills to find out what happened, all while trying to understand the magical world around him.
Well, perhaps the female elf has a special power that is the key to unlocking an ancient and powerful magic. Harry Potter, being the hero of the wizarding world, teams up with her. Along the way, they face many challenges, like battles with dark creatures and betrayal from within. Their relationship grows as they depend on each other more and more to achieve their goal.
A plot could involve Harry Potter and his friends coming to our world and meeting Spencer Reid. Reid could then help them solve a mystery in the Muggle world using his FBI training. At the same time, the wizarding gang could introduce Reid to magic, and he could learn how to use spells while still relying on his scientific mind. This would create an interesting dynamic between the two different worlds and sets of skills.