One interesting crossover could be the use of spells in the Call of Duty Zombies setting. For example, a wizard character from Harry Potter might use the 'Stupefy' spell to stun zombies instead of using a regular weapon. Another could be the Hogwarts castle being overrun by zombies, and the students and teachers having to fight them off using a combination of magic and the survival skills from Call of Duty. It could also be cool to see the Death Eaters team up with the zombies for some sort of dark alliance.
Perhaps a combination of Soap MacTavish from Call of Duty and Harry Potter himself. Soap is a highly skilled and experienced soldier, able to handle all kinds of combat situations. Harry has his unique magical abilities and his experience in fighting dark forces. Together, they could use their respective skills. Harry could use magic to deal with large groups of zombies at once, while Soap could use his combat skills to take out any remaining threats or handle any non - magical obstacles in their path.
A Harry Potter and Call of Duty crossover fanfiction might have the Hogwarts students being teleported into a Call of Duty battlefield. They would have to adapt their magic skills to the new environment. The Death Eaters could team up with the bad guys in Call of Duty. Wizards could use apparition to quickly move around the map, which would give a whole new dynamic to the typical Call of Duty gameplay.
In Call of Duty Zombies lemon fanfiction, there could be original characters created by the fans. These characters might be survivors who have a special affinity for lemons. They could be the ones who discover the lemon - related secrets in the game world. Maybe a character named Lemon - Lou, who is always looking for ways to use lemons against the zombies and becomes quite popular among the other survivors.
The story of Call of Duty Zombies involves a mysterious and terrifying outbreak of zombies in various settings. It often ties into secret experiments and hidden agendas.
Definitely Harry Potter himself. He's the hero in the Harry Potter series, so he would be a central figure in the crossover. He could use his skills and courage to lead the way in the new, combined world. Ron and Hermione would also be important, as they are Harry's closest friends and would support him throughout the adventure.
One idea could be Harry Potter characters being transported into the Call of Duty universe and having to use their magic in the middle of a modern warfare scenario. For example, Hermione might use spells to hack into enemy communication systems.
One interesting storyline could be about a group of survivors who find a mysterious lemon - shaped artifact in the Zombies mode. This artifact gives them special powers to fight off the zombies more effectively. They have to protect it while also dealing with the hordes.