In RWBY fanfiction, a transcendent Ichigo can bring a whole new dynamic. He could potentially have powers that far exceed the normal capabilities in the RWBY universe. His sword skills, for example, might be on a level that no one in RWBY has ever seen. This could lead to interesting interactions with the RWBY characters, like Ruby being in awe of his combat abilities.
One common theme is power - up. Since Ichigo is becoming transcendent, it often involves him gaining new and extraordinary powers that set him apart from his normal self in the original series. For example, he might have the ability to manipulate time or space.
He fits by being an overpowered character that disrupts the normal power balance. This can make for interesting stories as the RWBY characters have to adapt.
One great 'Bleach Ichigo Transcendent Crossover Fanfiction' is 'Ichigo in the World of Naruto'. It shows Ichigo's powers in a completely different ninja - filled world. His reiatsu stands out among the chakra - using ninjas. It's an exciting read as he has to adapt to new rules and also face off against powerful foes in the Naruto universe.
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's character may develop by becoming more confident in his powers. In the past, he has a chance to redo things and learn from his mistakes. He could become more strategic in battles, using his transcendent abilities more effectively.
Well, a common theme is exploring Ichigo's character development in a crossover. When he meets characters from other series, he might learn new ways of using his powers or gain new perspectives on his role as a protector. Another theme could be the clash of different power systems. For instance, if Ichigo crosses over with a character from a series with a completely different type of energy source, like chakra from Naruto. And there's the theme of friendship and camaraderie in a crossover fanfiction. Ichigo might form new bonds with characters he never would have met in his own Bleach universe, and these relationships can drive the story forward in interesting ways.
The story could then develop as Ichigo tries to find a way back home. Along the way, he gets caught up in the politics and battles of the DxD world. He might meet Issei and initially be at odds with him because of their different outlooks on power and combat. But as they face common enemies, they start to work together. Ichigo could also have run - ins with powerful devils like Sirzechs Lucifer, who might be intrigued by his power and want to either recruit him or eliminate him as a potential threat.
One possible plot could involve Ichigo's spiritual energy causing a ruckus in the DxD world. His power might be misinterpreted, and he has to prove that he's not a threat. At the same time, he could learn some unique abilities from the DxD characters, and they from him. For example, the devils in DxD might be interested in Ichigo's zanpakuto and its powers, while Ichigo could gain some knowledge about magic from them.