Rukia could be a great character to pair with Ichigo. Since they have a strong bond in the original series, in the fanfiction, she could follow him into the other world or be summoned there later. Their combined power and friendship would make for an interesting dynamic as they face new challenges.
It could be a powerful wizard or sorcerer in the new world who sees Ichigo as a threat to his rule. Maybe Ichigo's presence disrupts the balance of power that this antagonist has carefully maintained.
One possible plot twist could be that Ichigo discovers he has a special power in the new world that is completely different from his Soul Reaper powers. For example, he might be able to control the elements, which would change the way he approaches challenges.
Maybe in this other world, Ichigo discovers a group of people who are similar to the Soul Reapers but have different powers and a unique hierarchy. He could get involved in their internal conflicts and help bring peace while also trying to find a way back to his own world.
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.
Another plot could be that Ichigo is transported to a dimension that is a post - apocalyptic world. Here, his skills as a fighter would be put to the test. He might find remnants of a once - great civilization that had technology far different from his own, and he has to use both his swordsmanship and his wits to navigate this dangerous new world.
Ichigo's character develops by first being confused and out of place. But as he learns about magic, he starts to adapt. His sense of justice from the Bleach world makes him stand up against the bullies at Hogwarts, like Draco Malfoy. He also learns to use his powers in a new context. For example, he might combine his Soul Reaper strength with magic spells to create unique combat techniques.
If Ichigo was in the Naruto world, he would likely be a very powerful force. His Soul Reaper abilities like high - speed movement and powerful sword strikes could make him a formidable opponent. He might also have some interesting interactions with the ninja, perhaps teaching them about spiritual energy.
A good crossover character could be Naruto. He and Ichigo share some similarities in their determination and their growth as characters. They could team up in the new dimension, with Naruto's ninja skills and Ichigo's sword - fighting abilities making for an interesting combination against the new threats they face.
I recommend "A Character Model at the Beginning" to you. This is a story about the main character entering God's dimension and transmigrating to a different world. This included the world of Death, where the main character could become Ichimaru or even Amagasaki Ichigo. The entire novel was very interesting. One could see the collision and blending between different worlds, as well as the process of the protagonist becoming stronger by obtaining the source point. I hope you like this fairy's recommendation. Muah ~๐