One interesting plot could be the Avengers using their unique powers to combat the Titans in ways that surprise both the Titans and themselves. For example, Iron Man might develop new tech specifically designed to take on the Titans' massive size and strength.
One possible plot could be that the Avengers are somehow transported to the world of Attack on Titan. They team up with the Survey Corps to fight the Titans. Iron Man could use his high - tech suits to take on the Titans from a distance, while Captain America leads the ground troops along with Eren and his friends. Thor could use his lightning powers to stun the Titans, making it easier for the others to attack.
A plot where the Titans are actually created by a rogue Gundam scientist as a weapon of mass destruction could be really interesting. The Gundam pilots then have to team up with the people of Attack on Titan to stop these abominations they unknowingly created.
A fanfiction could also be based on the Avengers trying to find a way to reverse the Titan transformation. They might see the Titans as victims of some sort of dark magic or science gone wrong. Bruce Banner, with his scientific knowledge, teams up with Armin from Attack on Titan. Armin provides all the information he has about the Titans while Banner tries to come up with a solution. Meanwhile, the rest of the Avengers are fending off any Titans that come their way.
One interesting plot could be Ymir protecting Christa in a dangerous situation within the walls. Maybe when Titans are attacking, Ymir uses her unique abilities to fend them off and keep Christa safe. Another plot could be a story about their friendship growing deeper as they face the secrets of the world together. They might discover something about the origin of Titans that changes their perspective on everything.
Well, one interesting concept could be exploring the origin of the Baby Titan. Maybe it has a unique backstory that ties into the overall lore of Attack on Titan. For example, it could be related to some secret experiment by the Marleyans or an unforeseen consequence of the Titans' existence.
Some fanfictions in Attack on Titan 2 might explore the idea of the Walls having hidden secrets or functions. Maybe there are entire civilizations living within the Walls that the main characters are unaware of. Additionally, there could be fan - made Titans that have unique abilities, like a Titan that can control the elements, which adds a whole new layer of excitement to the story.
Well, Tony Stark would probably be making sarcastic comments throughout. He might say something like 'These Titans seem a bit more straightforward than our villains, at least they don't hide behind fancy tech.' Steve Rogers would be a bit more serious, maybe thinking about the themes of survival and fighting against overwhelming odds, seeing parallels to his own battles. Thor would be rather confused at first, trying to understand the strange world of the Titans and the humans fighting them.
It would be epic! Imagine Eren Yeager with the powers of the Hulk. He could transform into a titan - Hulk hybrid, with the strength of both. The Avengers would be both confused and intrigued by the existence of Titans. Maybe Captain America would try to form an alliance with the Survey Corps to fight a common enemy that threatens both their worlds.
Well, a great crossover would involve Hulk. Just imagine Hulk going berserk on the Titans. He could easily take them down with his brute strength. Then there's Black Widow, her combat skills and stealth could be used to gather intelligence on the Titans. Also, Hawkeye's archery skills could be useful in hitting the weak spots of the Titans from a distance. These crossovers would make for an exciting fanfic.
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.