Sasuke would be very interesting. His brooding nature and his powerful Sharingan abilities would add a different dynamic. He could use his Sharingan to quickly analyze the Titans' movements and weaknesses. And his thirst for power could lead to some interesting storylines, like him trying to figure out if there's a way to gain power from the Titans.
Kakashi would be a great crossover character. His calm and collected demeanor, along with his vast array of ninja skills, would be a great asset in the fight against the Titans. He could also be a mentor figure to the younger characters in the Attack on Titan world, teaching them about strategy and combat, just like he did with Naruto and his friends.
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.
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.
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 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 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.
Naruto and Eren would definitely have an interesting interaction. Naruto, with his belief in never giving up and always finding a way forward, could inspire Eren, who has his own strong will but is also burdened by a lot of anger. Their different ways of dealing with difficult situations would make for great dialogue. Also, Levi and Sasuke could be an interesting pair. They are both highly skilled fighters with a bit of a cold exterior. They might start off as rivals, but then come to respect each other's abilities as they fight together against the Titans.
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.
I think Levi from Attack on Titan would be fascinating in the Naruto world. His incredible combat skills could be enhanced with ninja techniques. He would be like a super - ninja, feared by all enemies. In the other direction, Sasuke would be an interesting crossover. His dark past and his search for power could lead to some really complex storylines in the world of Attack on Titan. He might be interested in the power of the Titans or try to use them for his own revenge.
Ichigo and Eren would be a very interesting pair. Ichigo has his powerful Soul Reaper and Hollow powers, and Eren has the power of the Titans. They could learn from each other, like Ichigo teaching Eren about controlling his inner power better, and Eren showing Ichigo the determination of the people in the Attack on Titan world.