Well, in some fanfictions, you might see Edward Elric from Fullmetal Alchemist teaming up with Eren Yeager from Attack on Titan. They could combine their unique abilities. Edward's knowledge of alchemy and Eren's Titan - shifting power could be used to take on common enemies. For example, they might face a new threat that is a combination of the Homunculi from Fullmetal Alchemist and some new type of super - Titan in the Attack on Titan world. And the different character dynamics, like Edward's hot - headedness and Eren's determination, would make for an exciting story.
A crossover could involve the Homunculi from Fullmetal Alchemist being a threat that the Avengers have to face. The Avengers would be challenged by their unique abilities and the complex nature of the Homunculi. The alchemists might then team up with the Avengers, sharing their knowledge of the Philosopher's Stone and its power, which could be crucial in fighting the Homunculi.
In some fanfictions, the Sharingan is combined with alchemical knowledge. Picture Sasuke or Itachi using their Sharingan to analyze and perform alchemy more effectively. Or perhaps a character from Fullmetal Alchemist Brotherhood discovers the power of the Sharingan and tries to replicate it using alchemy. Additionally, the concept of the Gate of Truth from Fullmetal Alchemist Brotherhood in the context of the Naruto world could lead to some really deep and thought - provoking stories. For example, what if Naruto had to face the Gate of Truth? How would his beliefs and his journey as a ninja be affected?
They have different themes and storylines. Fullmetal Alchemist focuses on alchemy and brotherhood, while Attack on Titan is about fighting giants for survival.
One interesting crossover could be the Titans having Pokemon abilities. For example, a Titan might have the strength of a Machamp, with its multiple arms being like Machamp's powerful limbs. Another could be the Survey Corps using Pokemon to aid in their battles against Titans. Maybe they could have flying Pokemon like Pidgeot to scout ahead or fire - type Pokemon to attack the Titans' weak points.
In a Pokemon - Attack on Titan fanfiction, we might see the Titan - shifters having an unexpected connection with certain Pokemon. Perhaps Eren's Titan form could be influenced by a powerful and rare Pokemon. Also, the different regions of the Pokemon world could be incorporated into the Attack on Titan universe. Like the Johto region could be a place where some of the Scouts find a special type of Pokemon that has a unique ability to counter the Titans.
If you combined Edward Elric and Eren Yeager, they would probably be very powerful. Edward has his alchemy skills which can be used for various things like creating weapons or barriers, and Eren has the ability to transform into a Titan. Together, they could use alchemy within the Titan form, perhaps creating stronger structures or weapons directly on the Titan's body.
One interesting crossover could be the Autobots and Decepticons getting involved in the fight against the Titans. The Autobots' advanced technology could be used to create new weapons or defenses against the Titans. For example, their energy shields might be able to withstand the Titans' attacks. Another aspect could be the Transformers' ability to transform into different forms being used in strategic ways within the walls. Maybe a Transformer could transform into a large structure to block a Titan's path or into a flying vehicle to scout for Titans from above.
In a crossover fanfiction, Naruto's sense of justice might conflict with Annie's actions in Attack on Titan. Naruto always tries to find a non - violent solution first, while Annie has been involved in some pretty brutal acts. This could lead to some great character development and interesting plot twists. Also, the different power systems of the three franchises could create unique battle scenarios, like a fight between Naruto's Rasengan and Annie's crystal - hardening abilities.
One interesting crossover could be the characters from Fairy Tail having to fight the Titans from Attack on Titan. For example, Natsu's fire magic could be used to take on the Titans in a really epic battle. His ability to quickly regenerate stamina might also give him an edge in the long - running battles against the Titans.
One interesting crossover could be the Jedi using their Force powers to combat the Titans in the world of Attack on Titan. For example, they could use the Force to predict the Titans' movements and dodge their attacks more effectively.