I think Hermione would be really interesting. She's so intelligent and resourceful in the 'Harry Potter' world. In a fanfiction with 'Legends of Tomorrow', she could use her vast knowledge of magic to help the Legends understand and deal with magical threats they encounter during their time - traveling adventures. She might be able to figure out how to combine magic with their technology in ways no one else could.
Ray Palmer is also interesting. His scientific knowledge from Arrow combined with his experiences in Legends of Tomorrow make him a unique character. You could write about how he uses his tech - savvy skills to help the combined team in a crossover. He could be the one to come up with a plan to defeat a powerful enemy using his shrinking technology or other inventions.
Doctor Strange would be an interesting character to focus on in a Harry Potter MCU fanfiction. He already has knowledge of magic in the MCU, but it's a different kind of magic compared to that in Harry Potter. He could compare and contrast the two magics, and perhaps even learn new spells from the Harry Potter universe. His presence could also bridge the gap between the two universes in terms of magic.
Hermione Granger would also be an interesting character to focus on. She's extremely intelligent and curious. In a crossover, she would be the one trying to figure out how The Flash's powers work from a scientific and magical perspective. She might even try to find a way to combine magic and the Flash's speed for some greater good. Her inquisitive nature would make for some great interactions with The Flash and would add a lot of depth to the crossover story.
I think it would be really interesting to focus on Hermione. She's so intelligent and curious. In Middle - earth, she could study the different magic and lore there. She might be the one to figure out how to combine the magic of the two worlds. For example, she could try to find a way to use the magic of Middle - earth to defeat Voldemort or help the Fellowship in a different way.
Harry Potter himself could be a great focus. Imagine him being introduced to the Halliwell sisters' way of life. His sense of justice and determination would be put to the test in a different magical context, and his relationship with Piper could develop in interesting ways as they learn from each other's magical experiences.
Harry Potter himself would be really interesting. He's used to facing dark wizards and magical threats, but the survival horror aspects of Until Dawn would be a whole new challenge for him. His courage and determination would be put to the test in a different way, like having to make quick decisions in a life - or - death situation without relying solely on his magic.
I think Naruto and Sara Lance would make an interesting pair. Naruto's positive attitude and never - give - up spirit could be a great influence on Sara, who has a more jaded view due to her past. And Sara's leadership skills and combat experience could also help Naruto in different situations. They could learn a lot from each other, especially when it comes to facing tough opponents.
Another great pairing could be Annabeth Chase and Ray Palmer. Annabeth is brilliant and strategic, while Ray is a scientific genius. They could collaborate on some amazing inventions or plans. Maybe they work together to create a device that can both detect mythological creatures and analyze their powers, using Annabeth's knowledge of mythology and Ray's scientific know - how.
I think it would be really interesting to focus on Hermione. Her thirst for knowledge would make her eager to learn about the world of Eragon, especially the dragon - riding and the different types of magic. She could also bring her logical thinking and problem - solving skills to the table, which would be very useful in both worlds.
I think Harry Potter himself would be very interesting. Imagine him in Neverland, a place so different from Hogwarts. He could bring his courage and sense of justice from the wizarding world and apply it in the new setting. His magic skills would also be fascinating to see in the context of Neverland, like how he would use spells against the likes of Captain Hook or other threats there.