What are some interesting ideas for an 'Attack on Titan' and 'Mel' crossover fanfiction?

One idea could be that the Soul Reapers have to enter the world of Attack on Titan to stop Hollows that are being created by the Titans' negative energy. Another could be that Eren Jaeger somehow gains Soul Reaper powers and uses them to fight both Titans and Hollows. Maybe Ichigo could end up in the walls and teach the Survey Corps his sword - fighting techniques to better combat the Titans.

In an 'Attack on Titan' and 'Titanfall' crossover fanfiction, there could be a plot where the world of 'Titanfall' is somehow connected to the world of 'Attack on Titan' through a rift in space - time. The Pilots could be sent to the 'Attack on Titan' world to help in the fight against the Titans. They could introduce their Titan - mech technology to the people there. The story could also focus on the cultural shock that both sides experience. The Pilots would be shocked by the primitive living conditions in 'Attack on Titan' while the 'Attack on Titan' characters would be amazed by the high - tech machinery of the Pilots.

The characters could interact through a shared goal. For example, if there's a new type of Titan threat that neither the 'Attack on Titan' characters nor Mel can handle alone, they have to work together. Eren might initially be distrustful of Mel, but as they face challenges together, they start to trust each other. Mikasa could be protective of Mel at first, seeing her as a vulnerable outsider in their dangerous world.

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.

A great idea for an 'Attack on Titan' permanent titan fanfic would be to focus on the relationship between a permanent titan and a human. It could be a story of an unlikely friendship or a situation where the human is trying to study the titan to gain some sort of advantage in the fight against the other titans. The fanfic could also delve into the emotional and psychological aspects of the titan, if it has any remnants of its former human self, and how it copes with its existence.

One idea could be that the Titans are somehow related to the Tailed Beasts in the Naruto world. Maybe they were created as a result of an ancient jutsu gone wrong. Another idea is to have characters from Attack on Titan gain ninja abilities. For example, Eren could learn how to use Rasengan and use it against the Titans. Or perhaps Naruto and his friends end up in the world of Attack on Titan and have to fight the Titans using their ninja skills.

One idea could be that your OC is a new recruit in the military and gradually gains the attention and affection of various popular characters like Eren, Levi, and Armin. They are all drawn to the OC's unique skills and personality.

A male OC in an Attack on Titan fanfiction could be a double agent. He pretends to be on the side of the Titans while actually working for the Survey Corps. He could have been captured by the Titans as a child and raised among them, but his human instincts and loyalty to his own kind make him turn against the Titans. Another interesting idea is a male OC who is a healer. In a world full of Titan attacks, most of the focus is on combat, but a healer OC could bring a new dimension to the story. He could develop new medical techniques to treat the wounded soldiers, and his struggle to keep people alive in the face of such danger could be a great plot point. And also, a male OC who is a historian, trying to uncover the secrets of the past about the Titans and the origin of the walls.

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.

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.