One common theme is the clash of cultures. The magical world of 'Harry Potter' has a very different set of rules and values compared to the harsh, survival - based world of 'Attack on Titan'. Another theme is power. How the magic from 'Harry Potter' can be a great equalizer or a source of chaos in the 'Attack on Titan' world.
One interesting crossover could be the Titans invading Hogwarts. The students would have to use their magic in new and creative ways to defend against the massive Titans. For example, they could use spells like Wingardium Leviosa to lift debris and block the Titans' paths, or use the Patronus charm to create a powerful force that might stun or repel the Titans. Another aspect could be the characters from Attack on Titan learning about magic. Eren might be intrigued by the power of magic and try to incorporate it into his fight against the Titans. He could potentially team up with Harry Potter and his friends to find a new way to defeat the Titans once and for all.
Well, I've read one where Hermione tries to use her knowledge to figure out a way to defeat the Titans more efficiently in the 'Attack on Titan' world. She starts researching about the Titans' biology and combines it with her magical knowledge. Another one has Ron being a bit of a bumbling hero in the Titan - infested land, often getting into comical yet dangerous situations.
Well, in such a fanfic, Harry Potter might find himself in the world of Attack on Titan. He could use his magic to fight the Titans in ways the Survey Corps has never seen before. Maybe he'd use spells like 'Wingardium Leviosa' to lift the Titans off the ground or 'Stupefy' to stun them. It would be really interesting to see how his magical abilities would interact with the technology and combat style of the Attack on Titan universe.
One great 'Attack on Titan' fanfiction with a Titan reader is 'Titan's Perspective'. It delves into how a reader - turned - Titan experiences the world within the walls. It offers a unique view of the familiar 'Attack on Titan' universe, exploring the inner thoughts and struggles of a Titan, which is something not often explored in the original series.
In some 'Harry in Attack on Titan fanfiction', Harry might bring his knowledge of potions to the world of Attack on Titan. He could create potions that give the soldiers enhanced strength or speed, similar to the Titan serum but without the negative side effects. This would completely change the dynamics of the fight against the Titans and make for a really exciting story.
His character might become more hardened. In the world of Attack on Titan, he has to face the constant threat of Titans. So, he may lose some of his innocence and become more battle - ready, like the characters in Attack on Titan.
The ODM gear and magic could work together in a really cool way. The ODM gear gives the characters in Attack on Titan the ability to move quickly and gracefully through the air. If combined with magic, perhaps a spell could be cast on the ODM gear to make it even faster or more maneuverable. For example, a simple speed - enhancing spell could be applied to the blades of the ODM gear, making them slice through Titans more easily. Or a levitation spell could be used in conjunction with the ODM gear to allow for even greater vertical movement, enabling the characters to reach heights they couldn't before.
One popular fanfiction idea could be a story where Eren has to team up with the Female Titan against a new, more powerful enemy in the world of Attack on Titan. Maybe they start off as reluctant allies, but as they face challenges together, they begin to understand each other better and develop a unique bond.
A common interesting plot point is the use of magic in the 'Attack on Titan' world. For instance, seeing how spells like Wingardium Leviosa could be used to move around the 3D Maneuver Gear more effectively or to levitate Titans. Another is the clash of cultures. The strict hierarchical society in 'Attack on Titan' and the more diverse and inclusive one in 'Harry Potter' can lead to some really engaging character interactions.