Another concept might be Ichigo crossing over with superheroes from Western comics. Picture Ichigo fighting alongside Superman or Batman. His unique reiatsu - based powers would be a great contrast to the superhuman abilities of the superheroes, and they could learn from each other's fighting styles.
A cool concept might be Ichigo having to adapt to an Asian - inspired magical realm that has its own set of rules and powers. This could lead to unique character development as he tries to figure out how to use his powers in this new environment.
The cultural mash - up is also cool. 'God' often represents a different cultural or spiritual concept, and when combined with Ichigo from a specific anime universe, it can create unique scenarios. Maybe it could involve different mythologies clashing or merging in the fanfiction.
One interesting concept could be how Ichigo's powers interact with the unique abilities in RWBY. For example, his Soul Reaper powers might contrast or complement the Dust - based abilities in RWBY. Maybe his Zanpakuto could have an unexpected reaction when used in the RWBY universe.
One interesting concept could be Ichigo crossing over into a different anime universe. For example, he might end up in a world full of magic like in 'Fairy Tail'. He could bring his unique Soul Reaper powers and have to adapt to the new rules and powers there. Another concept could be Ichigo teaming up with characters from other shows to fight a common enemy. This would lead to some really cool battle scenes and character interactions.
One interesting concept could be Ichigo's power evolution in a crossover setting. Since he's immortal, he might have the time to fully master and combine his various powers in unique ways. For example, his Shinigami, Hollow, and Quincy powers could blend more seamlessly, creating new and unforeseen abilities.
One interesting concept could be the new powers Ichigo might gain in the crossover. For example, he could combine his existing Soul Reaper powers with those from the other crossover element in a unique way, like having a new type of Zanpakuto ability.
Well, in 'ichigo is a god crossover fanfiction', perhaps an interesting concept is the moral implications of his godhood. He might struggle with whether to use his new - found powers for good or be tempted by the darker aspects of omnipotence. Also, the way his character design might change to reflect his god - like status, like having a more otherworldly appearance or aura.
One interesting concept could be the exploration of Ichigo's new powers in a 'dark godlike' form. It might involve him having enhanced combat abilities that are both awe - inspiring and a bit terrifying.
One interesting concept could be the combination of different character abilities from the original 'danmachi' and the crossed - over universe. For example, if it's a crossover with a magic - heavy world, seeing how the 'danmachi' characters adapt to and use new forms of magic would be really cool. Another concept might be the cultural clashes. Characters from 'danmachi' might have different values and social norms compared to the characters from the other world in the crossover, and exploring how they interact and deal with these differences can make for an engaging story. Also, the new relationships that form between characters from both universes, whether it's friendship, rivalry or even romance, add depth to the fanfic.
One interesting concept could be a crossover with other Victorian - era related works. It might bring in different characters and storylines from that time period, adding more depth to the Kuroshitsuji universe. For example, a crossover with Sherlock Holmes - like characters could lead to some exciting detective - related plots within the Kuroshitsuji world.