Well, 'The Byakuya Crossover Adventure' is a must - read. It takes Byakuya on a wild journey through different fictional universes. The author does a great job of keeping Byakuya's character intact while still allowing him to grow in new and exciting ways. Another story is 'Byakuya's Crossover Dilemma' where he has to choose between his loyalty to Bleach's world and the new world he's been thrust into.
You can start by looking on fanfiction.net. It has a large collection of 'Bleach' crossover fanfictions. There are different categories and filters you can use to narrow down your search. Another good place is Archive of Our Own (AO3). It also has a great selection of such fanfictions. The tagging system on AO3 makes it easy to find exactly what you're looking for.
One great 'Bleach' crossover fanfiction is 'Bleach x Naruto: Soul Reaper of Konoha'. It combines the worlds of 'Bleach' and 'Naruto' in an interesting way. The story follows a character who has powers from both universes and has to navigate the challenges of both worlds. Another is 'Bleach x One Piece: Pirates of the Spirit World'. Here, the Straw Hat Pirates end up in the 'Bleach' universe and interact with the Soul Reapers in a really fun and action - packed story.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Use their search functions and type in 'Naruto Bleach crossover'. Then, look at the ratings and reviews of the stories that come up. Stories with high ratings and positive reviews are usually a good bet.
One idea could be that Ichigo Kurosaki from Bleach somehow gets transported to the Victorian era world of Black Butler. He could be mistaken for a demon or some kind of otherworldly being. Sebastian, being the ever - curious demon, might be intrigued by Ichigo's powers and his strong sense of justice. Another idea is that Ciel Phantomhive has to deal with Hollows suddenly appearing in his world. He enlists the help of the Soul Reapers from Bleach to combat this new threat. They could form an uneasy alliance where the Soul Reapers are not used to the complex politics of the Black Butler world, and Ciel has to figure out how to work with these super - powered beings.
I really like 'The Shinigami and the Ninja'. It's a well - written fanfic where the author does a great job of integrating the different mythologies and power systems. You get to see Bleach characters like Rukia in the Naruto world, dealing with things like chakra and ninja villages. It adds a fresh twist to both universes.
One characteristic is the exploration of new settings. Since it's a crossover, Toshiro is often placed in different fictional worlds or situations not in the original Bleach story. For example, he might end up in a steampunk world or a world with magic systems different from Soul Society's.
One interesting idea could be that characters from Bleach are somehow transported to the Naruto world during the Chunin Exams. For example, Ichigo could end up participating in the exams. He might use his Soul Reaper powers in the forest of death, which would give him an edge against the ninja there. His Zanpakuto skills could be misinterpreted as some kind of advanced ninja tool or jutsu.
A good 'Bleach' crossover fanfiction often has well - integrated universes. For example, if it's a 'Bleach' and 'Dragon Ball' crossover, the power levels and the different types of energy in both worlds should be combined in a believable way. If the fanfic just throws the characters together without any thought to how their worlds' rules work, it won't be as good.
One great Hinata crossover with Bleach fanfiction is 'Hinata in the World of Bleach'. It shows Hinata from Naruto ending up in the Bleach universe. She brings her unique skills and gentle nature to the story. It's interesting to see how she interacts with the characters in Bleach like Ichigo and Rukia.