A possible plot twist could be that the Omnitrix has some sort of connection to the Titans' origin. Maybe it was created by an ancient civilization that also had a hand in creating the Titans. This would lead to Ben and the Attack on Titan characters having to work together to figure out this mystery. They might discover that certain alien forms can either control or neutralize the Titans in ways they never expected, which would add a whole new layer of complexity and excitement to the fanfiction.
One exciting plot twist could be Ben using his alien forms in unexpected ways within the Attack on Titan world. For example, using Heatblast to melt through the Titans' hard exteriors in a crucial battle. Another could be a character from Attack on Titan getting the Omnitrix and having to learn how to use it. This would completely change the power dynamics in the story.
Well, a really cool plot twist might be if there was a fusion of Ben's aliens with the Titans. Imagine a Four Arms - Titan hybrid that has the strength of Four Arms and the size and some of the characteristics of a Titan. It would be a game - changer in the battles against the other Titans. Also, if Eren somehow got the ability to transform into some of Ben's aliens, it would be a wild turn of events, especially considering Eren's original Titan - shifting ability.
One interesting plot twist could be the ghouls in the Attack on Titan world. Imagine if ghouls were hidden among the titans. They could feed on the bodies of dead titans or even on the soldiers without being detected at first. Another could be the Ackermans having some sort of connection to the ghoul powers. Maybe their enhanced strength is related to a dormant ghoul gene. And a third could be the Scouts finding a way to use ghouls' kagune to fight the titans more effectively, like creating weapons out of kagune material.
The cultural clash. The Marvel heroes come from a world with a different set of values compared to the more survival - based world of Attack on Titan. Seeing how they interact and try to understand each other's motives would be really engaging. For example, Steve Rogers might try to instill his sense of justice and freedom in the characters of Attack on Titan, while they might show him the harsh realities of their world.
A cool plot twist could be a ghoul - Titan hybrid. Imagine a Titan with the regenerative abilities of a ghoul. This would pose a whole new level of threat to the characters from both universes. Also, the idea of the ghouls' coffee being a valuable resource in the Attack on Titan world could be an interesting twist. Since coffee is so important to ghouls, it could have some unforeseen effects on the Titans or the people in that world.
Well, in many of them, the first encounter between Godzilla and the Titans is always exciting. It's like two huge forces colliding. For example, in some stories, Godzilla's atomic breath against the Titans' powers creates a really intense moment.
Well, one of the most interesting plot twists could be a character that was thought to be on the side of the humans actually being a secret agent for the Titans all along. This would completely change the dynamic of the story and the relationships between the characters.
In a Naruto and Ben 10 crossover fanfiction, an exciting plot twist could be that the DNA of the aliens in Ben's Omnitrix starts to mix with the chakra in Naruto's world. This could result in new forms for both Ben and Naruto. For Naruto, he might gain the ability to transform into a half - alien, half - ninja hybrid with unique powers. Ben, on the other hand, could find that his alien forms now have chakra - based abilities. This would not only change their powers but also how they interact with their respective worlds and enemies.
One exciting plot twist could be the discovery of a hidden connection between Smallville's Clark Kent and The Flash's Barry Allen that predates their superhero identities. Maybe they are related in some way through their alien or metahuman genetics. Another could be a villain who has the ability to manipulate time and space, causing chaos in both Smallville and Central City. This would force Clark and Barry to work together in ways they haven't before. A third plot twist might be that a character from Smallville who was thought to be normal actually has latent superpowers that are activated during the crossover, adding an unexpected element to the story.
One interesting plot point could be Spiderman trying to understand the complex politics and social structures in the Attack on Titan world. Another could be him using his scientific knowledge to find a new way to defeat the Titans. For example, he might create a special web - based formula that can immobilize them.
Well, perhaps there could be a crossover where a villain from The Flash, say Reverse - Flash, teams up with a Hydra agent from Agents of Shield. This alliance would be a huge shock as they combine their powers and knowledge. Reverse - Flash's speed and ability to manipulate time along with Hydra's devious plans could create a very difficult situation for the heroes from both universes to handle.
Maybe a character from Halo, like Master Chief, gets transported into the GI Joe universe. He has to adapt to their different warfare style and politics. Meanwhile, the GI Joe characters are in awe of his advanced armor and combat abilities. This creates a lot of interesting interactions as they try to figure out how to send him back while also using his skills to fight their own enemies.