A survival - themed plot could be interesting. For example, the Titan submarine could get stranded in an unexplored part of the ocean. The crew then has to deal with limited resources, strange underwater phenomena, and their own internal conflicts as they try to find a way to be rescued.
Perhaps the friendly titan is a protector of a certain area outside the walls that the humans have not explored much. The story could be about the Survey Corps making an alliance with this titan. The titan guards the area from other dangerous titans, and in return, the humans help the titan when it gets injured. This could lead to a whole new understanding of the titan world and how they can co - exist with the friendly ones.
Another idea is that the Queens Titan has a past connection to a long - lost civilization. As the story unfolds, it uncovers secrets about this civilization that change its perception of itself and its role in the world. It could involve solving ancient mysteries and facing challenges set by the remnants of that civilization.
One idea could be exploring an alternate timeline where the main characters have different Titan powers. For example, Eren could have the Colossal Titan's power from the start. Another could be a story centered around a new character who joins the Survey Corps and has a unique ability to communicate with Titans on a deeper level. Maybe they try to find a peaceful coexistence with the Titans instead of just fighting them all the time.
A really cool idea for Armored Titan crossover fanfiction would be to have it cross over with a world of superhumans. The Armored Titan's abilities would be put to the test against those with super speed, strength, or mind - control powers. The story could explore how the Armored Titan tries to fit into this new world, whether it becomes a hero or a villain, and how it deals with the complex politics and power struggles among the superhumans.
One idea could be exploring an alternate timeline where Eren never became a Titan. Maybe the Scouts find a different way to fight the Titans, relying more on advanced technology and strategic warfare. Another could be a fanfiction centered around a new character who has a unique ability to communicate with Titans in a non - aggressive way, changing the whole dynamic of the battle.
One idea could be an OC who has a unique ability to communicate with the Titans. This could lead to a whole new way of dealing with the Titan threat, like trying to negotiate or understand their motives. Another plot could revolve around an OC from a different nation outside the Walls who has their own knowledge and skills regarding Titans. They could bring in new strategies and technologies.
One plot idea could be a Naruto - style ninja having to team up with a demi - titan to protect their village from a new, powerful enemy. The demi - titan's brute strength combined with the ninja's skills would make for an exciting story.
A plot could revolve around a hidden village within the Naruto universe that has been secretly studying Titan powers for generations. A young ninja from this village embarks on a journey to find out more about their origin. Along the way, they meet other Naruto characters and together they uncover secrets about both the Titans and the ninja world that could change everything. This could involve epic battles and unexpected alliances.
One idea could be Percy discovering new powers inherited from his Titan heritage that set him apart from other demigods. For example, he might be able to control time on a small scale, like slowing it down during a battle to gain an advantage.
The plot could involve a conflict within the group of titan shifters because of the tenth titan. Some might see it as a threat, while others believe it's the solution to end the war. The tenth titan's power could be something that disrupts the balance between the different factions. For example, it could have the ability to nullify the powers of other titans, which would make it a highly sought - after and dangerous power.