Rukia could be a great character to pair with Ichigo in a different world crossover. She has her own set of powers and a calm, intelligent mind. In a strange new world, she could help Ichigo analyze new situations and come up with strategies. Their bond as comrades from the Soul Society would be interesting to explore in a different setting.
One idea could be Ichigo ending up in a high - fantasy world filled with magic. He could learn to combine his soul reaper powers with the new magic system, creating unique combat styles. For example, he might infuse his Getsuga Tensho with elemental magic from that world.
The overall tone of the story can be different. While the original Bleach has its own action - packed and somewhat dark tone, the crossover could introduce a more spiritual and ethereal element due to the 'god' aspect. It could explore deeper philosophical questions about existence, power, and the nature of good and evil.
One interesting character to crossover with Ichigo is Light Yagami from Death Note. The clash between Ichigo, who is a protector, and Light, who is a morally ambiguous character with the power to kill, would be very engaging. Saitama from One - Punch Man could also be a great choice. Saitama's overpowered nature and Ichigo's journey to become stronger would make for an interesting story. And what about Alucard from Hellsing? His vampire powers and Ichigo's powers related to the afterlife would create a really dark and exciting crossover.
Aizen Sousuke would be an interesting crossover character. Since he's so powerful and manipulative in the Bleach universe, seeing him in a different setting with Ichigo could create some really complex and intense storylines. They could be forced to work together against an even greater evil in a crossover universe.
Ichigo could meet Frodo Baggins. Frodo, being from a very different kind of world, would find Ichigo's situation strange. But they could bond over their shared sense of being out of place in some ways. Frodo could teach Ichigo about the importance of perseverance in the face of great odds, and Ichigo could protect Frodo from any potential threats in this crossover world with his swordsmanship.
One idea could be that Ichigo and Naruto are brought together by some sort of interdimensional rift. They initially don't understand each other's powers but soon realize they share a common goal of protecting their friends and worlds. They could team up to fight a powerful enemy that threatens both their universes.
Ichigo's powers would have a significant impact. His soul reaper abilities, such as his high - speed movement and powerful sword attacks, would make him a formidable force in the Sekirei world. He could easily defend the Sekirei from their enemies. Also, his ability to sense spiritual energy would allow him to detect any hidden threats or the true nature of some Sekirei who might be hiding their powers. This would disrupt the balance of power in the Sekirei Plan as he would not be bound by the normal rules of that world.
It could completely change the dynamics of his powers and battles. Maybe a new Zanpakuto would give him unique abilities or force him to adapt his fighting style in unexpected ways.
In such fanfiction, Ichigo's character might develop a greater sense of adaptability. Since he has a different zanpakuto, he has to learn new ways to fight and control his power. This could make him more resourceful in battles.