Aizen and Zeke would be a very unique pairing. Aizen is a master manipulator in Bleach, and Zeke has his own plans and manipulations in Attack on Titan. Their meeting could lead to a complex web of schemes. Aizen might be interested in Zeke's knowledge of the Titans and Zeke could see Aizen as a powerful ally or a threat depending on how things play out.
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.
Rukia and Mikasa could be an amazing pair. Rukia is a skilled Soul Reaper, and Mikasa is a highly capable fighter in the Attack on Titan world. They could bond over their loyalty to their friends and their determination to protect. Rukia could teach Mikasa some of the Soul Reaper techniques, and Mikasa could show Rukia the brutal reality of the Titan - infested world.
Ichigo and Inuyasha would be a very interesting pair. Ichigo has his inner Hollow and his strong sense of justice. Inuyasha is a half - demon with a short temper but also a good heart. Their interactions would be full of clashes and also mutual respect as they both fight against evil in their own ways.
The combination of different power systems. In Bleach, you have spiritual powers like zanpakuto and kido, while in Attack on Titan, there are the unique abilities related to the Titans. Seeing how these interact in a crossover is really cool.
Eren and Raleigh would be likely to team up. Eren has his powerful titan - shifting abilities which could be useful in close - combat situations against both titans and Kaiju. Raleigh, with his experience in piloting a Jaeger, could guide Eren on how to better use his powers in coordination with the large - scale technology of the Jaegers. They could form a strong bond as they both have a strong sense of justice and a desire to protect their respective worlds.
Sonic and Pikachu would be a really interesting pair. Sonic's high - speed and adventurous nature combined with Pikachu's electric powers and cute but brave personality could lead to some really fun and action - packed scenes. They could race each other and then work together to face challenges.
Naruto and Tsukune would be an interesting pair. Naruto's energetic and determined nature combined with Tsukune's kind heart and his own growth as a character in the Rosario world could lead to some great interactions. They could learn from each other's ways of dealing with challenges and protecting their friends.
Another interesting pairing could be Ben and Captain America. Cap's leadership and moral compass could influence Ben, while Ben's diverse powers could be a great asset to Cap in battle. They could be in a situation where they have to fight against a mind - controlled army, and Ben's aliens like Big Chill could freeze the enemies in place while Cap gives strategic commands.
Lex Luthor and Michael from Roswell would make for an exciting duo. Lex is always looking for power and knowledge, and Michael is a bit of a rebel alien. Lex might see Michael as a way to gain access to the alien technology from Roswell. Michael, on the other hand, might be suspicious of Lex but also intrigued by his resources. Their interactions would be full of tension and power plays.
I think Lloyd from Ninjago and Laval from Chima would make an interesting pair. Lloyd is the Green Ninja, with great power and a sense of responsibility. Laval is a brave leader in Chima. They could learn a lot from each other. Lloyd could teach Laval about the importance of self - discipline in using power, and Laval could show Lloyd how to be more in tune with nature, which is important in Chima. Their different leadership styles would also create an interesting dynamic. Lloyd is more of a quiet, determined leader, while Laval is more bold and outspoken.
I think Knuckles from Sonic and Lucario from Pokemon would make a great pair. Knuckles is strong and has a connection to ancient powers, similar to Lucario which has a strong sense of aura. They could bond over their shared connection to something deeper. In a fanfiction, they could team up to protect an ancient temple that has significance in both the Sonic and Pokemon worlds. Lucario could use its aura - sensing abilities to detect threats, while Knuckles could use his strength to fight off any physical attackers.
Wolverine and Thor would be an exciting pair. Thor is a god with his hammer and super strength, and Wolverine is a tough mutant. They could have an epic battle at first, maybe due to a misunderstanding. But then realize they have a common enemy. Wolverine might be in awe of Thor's power, while Thor could respect Wolverine's tenacity and never - give - up attitude.