One way the plot could develop is that the villains from both universes team up. Loki could make a deal with the Beast Titan. They could plan to take over both worlds. The Avengers and the Attack on Titan characters would then have to put aside their differences and combine their forces. For instance, Hawkeye could use his archery skills along with the Scouts' long - range weapons. The Scarlet Witch could use her powers to control the minds of some of the smaller Titans, while the Survey Corps uses this distraction to attack the larger ones.
The plot could start with a common threat. Maybe a new type of Titan that has powers similar to the Infinity Stones appears in the Attack on Titan world. The Avengers are somehow alerted to this and travel through a dimensional rift to help. They would bring their own set of skills and technology. The Avengers' high - tech gadgets could be a huge advantage against the Titans, while the Scouts' knowledge of the Titans' behavior and the terrain would be invaluable to the Avengers.
Well, one possible plot could be that the Titans somehow cross into the Avengers' universe. Maybe Thanos' snap disrupted the fabric of reality and opened a portal to the Attack on Titan world. The Avengers, seeing these giant, menacing Titans, would initially be shocked. Iron Man could start analyzing the Titans' weaknesses while Captain America rallies the team to fight. Meanwhile, Eren Yeager and the Survey Corps might find themselves in New York City and team up with the Avengers. They'd share their combat skills against the Titans, and Eren could show off his Titan - shifting abilities, which would be a huge asset to the Avengers.
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.
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.
Sakura's character could develop in several ways. First, she might become more hardened due to the constant threat of Titans. In the Naruto world, she had to face strong opponents, but the Titans are a whole different level of danger. This could make her more cautious and strategic in her actions.
The crossover comic could have complex storylines. Maybe it'd explore how the different worlds and characters interact and how they handle the combined threats. It could lead to some mind-blowing action and character development.
I think Iron Man and Armin would be an interesting pairing. Iron Man with his brilliant mind and high - tech gadgets could learn a lot from Armin's strategic thinking. And Armin could be amazed by Iron Man's technology and learn new ways to fight the Titans.
Captain America and Levi Ackerman would be another great pair. Both are highly skilled fighters and leaders. They would probably respect each other's combat abilities right away. Captain America could learn a thing or two about Levi's quick - draw and precise fighting style, and Levi might be inspired by Captain America's unwavering sense of justice and leadership. They could lead their respective groups in the fight against the combined threats of the Titans and any villains from the Avengers' world.
It's hard to say. Thor has his godly powers and his hammer Mjolnir which gives him great strength. But in the 'Attack on Titan' world, Eren's Titan form is also extremely powerful. However, if we consider all - around power, Iron Man with his advanced technology and ability to constantly upgrade his suit might be the most powerful. He could analyze the Titans' weaknesses and come up with strategies to take them down.
The 'Attack on Titan' characters would be quite shocked by the technology and the general chaos in the 'Gintama' world. Characters like Armin would be very interested in all the strange inventions and the way society functions in 'Gintama'. He might try to understand the economic and political systems there. And the 'Gintama' characters would be in awe of the 'Attack on Titan' characters' ability to fight Titans. They could team up to face common enemies or just have a series of comical misunderstandings that lead to all sorts of adventures.
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.