Levi Ackerman would be an interesting choice. His exceptional combat skills and no - nonsense attitude would make him stand out in the Destiny universe. He could quickly adapt to the Guardians' fighting styles and weapons. His precision with the blades could be compared to the Guardians' accuracy with their guns. And his loyalty to his comrades would be an asset when dealing with the various factions in Destiny. He would be intrigued by the different races and the concept of the Light, and would likely use his skills to protect those in need in the new world.
Armin Arlert could also be a great crossover character. His intelligence and strategic mind would be valuable in the Destiny universe. He could analyze the enemies in Destiny, like the Fallen or the Cabal, and come up with plans to defeat them. He might be fascinated by the technology and lore of Destiny, and could potentially find ways to use it to his advantage. His ability to think outside the box would make him an interesting addition to the Guardian ranks, and he could form alliances with different groups within the Destiny world based on his knowledge and understanding.
It has to be Naruto himself. His never - give - up attitude and his ability to make friends easily would make him a great addition to the world of Attack on Titan. He could inspire the characters in that world, like Eren, to keep fighting even in the face of despair. Also, his unique powers would be really cool to see against the Titans.
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.
Eren could be really interesting. Given his ability to transform into a Titan, he might be curious about Godzilla and try to understand his power. He could also see Godzilla as a rival in terms of power and might try to prove himself by interacting with Godzilla in some way.
I think Hinata and Mikasa would make a great pairing. Hinata is gentle but strong - willed, and Mikasa is extremely protective. They could bond over their loyalty to their friends and loved ones. Another interesting pairing could be Kakashi and Erwin. They are both great leaders. Kakashi with his wisdom and combat experience, and Erwin with his strategic mind. They could work together to plan attacks against the Titans or any other threats in the crossover world.
I think Naruto and Levi would be really interesting. Naruto's positive and determined attitude would contrast with Levi's more stoic and no - nonsense personality. They could learn a great deal from each other. Naruto could teach Levi about the power of friendship and believing in oneself, while Levi could show Naruto some of his amazing combat skills and discipline.
I think Eren and Saitama would also be a great pair. Eren has his complex motives and the power of the Titans, and Saitama is so simple - minded yet incredibly strong. They could interact in a really unique way, like Eren being all fired up to fight Titans and Saitama just being like 'Oh, that's nice' and then one - punching all the Titans. It would be a contrast of personalities and powers.
I think an unexpected pairing would be Thor and Levi. Thor is this powerful god from Asgard, used to grand battles and magic, while Levi is a very skilled and no - nonsense human from the Attack on Titan world. They would probably clash at first due to their different personalities, but then learn to respect each other's skills.
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.
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.
Definitely Optimus and Eren. Eren is so driven by his goals of destroying all Titans, and Optimus has his own sense of justice and protecting the innocent. Their interaction could be intense as they both come from very different worlds but share a common goal of protecting others. Eren could be in awe of Optimus' power and size, and Optimus could see Eren's determination as a valuable trait.