One idea could be that the technology from the Transformers is used to create new weapons against the Titans. For example, Optimus Prime could help Hange Zoe develop some sort of energy - based blades that can cut through Titan skin more easily. And in return, the humans could offer their knowledge of the terrain and strategic locations to the Autobots to help them hide from the Decepticons.
The plot might involve the Titans having some sort of Energon - like substance in their bodies that the Transformers need. This would lead to a complex situation where both the humans from Attack on Titan and the Autobots have to negotiate and work together. At the same time, the Decepticons could see this as an opportunity to take over both the Titan - filled world and get the valuable Energon - like resource, creating a three - way conflict.
Well, it could be about the Survey Corps finding a crashed Cybertronian ship. Maybe the Titans are somehow related to a Decepticon experiment gone wrong. The Scouts would then team up with the Autobots to fight both the Titans and the Decepticons.
The story could begin with Optimus Prime leading the Autobots to a new dimension in search of a powerful energy source. This dimension turns out to be the world of Attack on Titan. The Survey Corps mistakes the Autobots for new threats at first. However, Armin, being the intelligent one, quickly realizes that they might be able to help in the fight against the Titans. Meanwhile, Megatron and some Decepticons also arrive. They see the Titans as potential weapons or servants. The Autobots then form an alliance with the Survey Corps. Optimus Prime is impressed by the courage of the humans, especially Mikasa Ackerman. As they battle the Titans together, the Autobots teach the humans about advanced technology, and the humans show the Autobots the importance of unity and tenacity in the face of a seemingly unbeatable enemy.
Eren could be really inquisitive about the Transformers' powers. He might try to learn from them how to better use his Titan - shifting abilities. The Autobots, like Bumblebee, would be friendly and try to communicate with the humans in their own way, which could be a bit difficult at first but they would manage.
One possible plot could be that the Titans are actually some kind of ancient, corrupted Transformers. The Survey Corps discovers a hidden technology that has the power to control or at least influence the Titans. Eren, with his Titan - shifting ability, might have a special connection to this technology. The Autobots arrive on the scene, initially seen as a threat by the humans. But as they learn about the Titans, they team up with the Survey Corps to fight against this common enemy, using their advanced weaponry and Eren's unique power.
Well, it could be about the Survey Corps teaming up with the Avengers. Maybe Eren's titan form could be as strong as the Hulk in a battle against a common enemy like Thanos. The Scouts' ODM gear would be an interesting contrast to the high - tech gadgets of the Marvel heroes.
Well, it could be about Eren Yeager somehow getting transported to the Naruto world. Maybe he teams up with Naruto to fight against a common enemy like the Akatsuki who have somehow gotten their hands on Titan powers. They would have to combine their unique skills, Eren's Titan transformation and Naruto's jutsu.
One interesting interaction could be between Optimus Prime and Erwin Smith. Optimus, with his strong sense of leadership and justice, would likely respect Erwin's strategic mind and his willingness to sacrifice for the greater good. They could exchange ideas on leading their respective groups in the face of great danger. Another would be between Bumblebee and Eren. Bumblebee's friendly and curious nature could contrast with Eren's often - brooding and determined self. Eren could be amazed by Bumblebee's technology and abilities, while Bumblebee could be intrigued by Eren's Titan - shifting power.
Eren would definitely be a main character. His ability to transform into a Titan makes him a unique element in the crossover. He could interact with the Transformers in interesting ways, like learning from their technology or using his power in combination with their weaponry. Optimus Prime would also be a main character. His leadership and strong moral compass would be crucial in bringing the two groups together. He could inspire the characters from Attack on Titan to see a bigger picture and fight for more than just survival. Mikasa would be another key character. Her loyalty and combat skills would be valuable in the fight against the combined threats that might come up in the crossover.
One possible plot could be that the Titans somehow cross into Spider - Man's universe. Spider - Man initially mistakes them for some new kind of giant robots or mutants. He tries to fight them using his web - slinging and acrobatic skills. But he quickly realizes they are much more difficult to defeat as they keep regenerating. Meanwhile, some of the Survey Corps members from Attack on Titan also cross over. They team up with Spider - Man, teaching him about the Titans' weak points at the back of their necks. Together, they fight to keep both universes safe from the Titans.
One common theme is the clash of different power systems. For example, when crossing over with a magic - based series, the contrast between the Titans' brute force and magic is explored.
In a 'halo crossover attack on titan fanfic', there could be many interesting scenarios. For example, Master Chief could team up with Eren Yeager. Master Chief with his superhuman abilities and advanced weaponry could offer new strategies to fight the Titans. The fanfic might also explore how the different cultures and power systems in both Halo and Attack on Titan clash or merge. It could be a story full of action, adventure, and the exploration of two very different fictional worlds coming together.