Harry Potter and Nate Ford could be a likely pair. Harry's experience with facing great evils and his leadership skills combined with Nate's strategic mind in planning heists would make for an interesting dynamic. They could learn from each other's methods of problem - solving.
Another possible pair could be Ron Weasley and Eliot Spencer. Ron is brave and has a good heart, though sometimes a bit clumsy, while Eliot is a highly skilled fighter. Ron could learn some self - defense and combat skills from Eliot, and Eliot could be introduced to the strange and wonderful world of wizard food and magical creatures through Ron. Their friendship could develop as they overcome challenges together in the crossover scenarios.
Harry Potter and Ichigo Kurosaki are very likely to be paired. They are both the main protagonists in their respective series. Harry has his strong sense of justice and magical powers, and Ichigo has his determination and Soul Reaper abilities. They could form a great partnership to fight against common enemies.
Ron and Uryu might be paired. Ron has his own insecurities but also his moments of great courage, much like Uryu. They could bond over their skills in combat, Ron with his magic and Uryu with his Quincy powers.
Harry Potter and Captain America are likely to be paired. Harry is used to leading a group against dark forces, and Captain America is a natural leader too. Their leadership styles could complement each other. Also, they both have a strong sense of justice.
Percy Jackson and Carter Kane would be a great pair. Percy is used to the Greek mythological world and its challenges, while Carter has a deep understanding of Egyptian magic and mythology. Their different perspectives could lead to some interesting teamwork, like when they face a monster that has aspects of both Greek and Egyptian mythology, such as a Sphinx with the ability to use water attacks like a Greek hydra.
Yoko from Gurren Lagann and Hermione Granger could be paired. Yoko is a strong and independent female character, and Hermione is brilliant and resourceful. They could team up to face challenges, with Yoko providing her combat skills and Hermione her vast knowledge of magic. Their combination could be a force to be reckoned with in the fanfic.
Luna and Neville would be another possible pair. They are both somewhat outcasts in their own ways in the Harry Potter world. In the fanfic, when the bottle lands on them, it could lead to a really sweet and heartwarming moment. They could bond over their shared experiences and unique perspectives on magic, and perhaps develop a deeper relationship.
The Doom Slayer and Commander Shepard are likely to be paired. They are both iconic heroes in their respective universes. Shepard is a strategic leader, while the Doom Slayer is a force of pure destruction. Their interactions could lead to some really interesting storylines.
Master Chief from Halo and Apollo from Battlestar Galactica could be an interesting pair. Master Chief is a super - soldier with incredible combat skills, and Apollo is a skilled pilot and military leader. Their different skillsets could lead to some great teamwork in a crossover story. Another possible pair could be Cortana and Starbuck. Cortana is an AI with vast knowledge, and Starbuck is a brash but talented pilot. They could have some really interesting exchanges, with Cortana providing strategic advice to Starbuck.
Buffy and Luke Skywalker could be an interesting pair. Buffy is a strong fighter and leader in her world, and Luke is a key figure in the Star Wars universe. They could learn from each other's combat styles and leadership skills.
Caleb Prior from Divergent and Ron Weasley might be a crossover. Caleb is intelligent but has his own moral dilemmas, and Ron is a loyal friend with his own insecurities. Their friendship or conflict could be explored in the fanfiction, perhaps with Caleb getting involved in Ron's wizarding adventures and Ron learning about the Divergent world through Caleb.