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.
Well, a cool crossover fanfiction could be with the DC universe. Imagine Ichigo meeting Superman. They would surely have different views on justice. Superman is all about truth, justice, and the American way, while Ichigo is more about protecting his friends and the spirit world. Their meeting could lead to some intense debates and also team - ups against powerful villains.
One popular trope is the power - up trope. In many crossovers, Ichigo's already formidable powers from Bleach are enhanced or combined in unique ways with the elements from the crossover universe. For example, if it's a crossover with a superhero universe, he might gain new abilities like flight on top of his existing sword - based powers. Another common trope is the 'fish - out - of - water' scenario. Ichigo, being from the Bleach universe, finds himself in a completely different and often bewildering new world in the crossover. This allows for a lot of comical and also character - building moments as he tries to adapt. Also, the team - up trope is quite frequent. He teams up with characters from the other universe against a common enemy, which often leads to interesting dynamics and power combinations.
Another great character to include would be Saitama from One - Punch Man. His nonchalant attitude towards fighting, despite being extremely powerful, would be really fun to pair with Ichigo. Ichigo might be frustrated by Saitama's lack of excitement during battles, while Saitama could be intrigued by Ichigo's complex powers.
In lemon fanfiction, Ichigo Kurosaki might be depicted with a different personality. Sometimes, authors explore his more emotional and vulnerable sides that might not be as prominent in the original work. For example, he could be shown in a romantic relationship where his protective nature is emphasized in a new way.
One appeal is that it gives fans a chance to see Ichigo in new and unexpected situations. Since lemon fanfiction often involves romantic or steamy elements, it can show a different side of his character that we don't usually get to see in the main series.
One idea could be Ichigo crossing over into a different anime universe like the Naruto world. He could meet Naruto and they'd team up against a common enemy. Maybe a powerful new threat that combines the powers of Hollows and the Tailed Beasts.
One idea could be a crossover where Ichigo and Naruto are transported to a strange new world together. They have to combine their skills, like Ichigo's Zanpakuto abilities and Naruto's ninjutsu, to find a way back home.
Another fanfiction could be a story where Sakura, for some reason, is transported to the world of Bleach. She enrolls in the Soul Reaper academy, where she meets Ichigo. They start off as rivals, constantly competing in combat training and academics. But as time passes, they realize they have a lot in common and end up becoming good friends and allies.
Writers should focus on his core values. Ichigo is a character who deeply values protecting his friends and family. So in a crossover, he should still show that same level of dedication. For example, if he's in a situation where he has to choose between a new goal in the crossover world and saving a friend, he should choose his friend. Also, his hot - headed nature should be maintained. He's not one to back down from a fight, especially when he believes he's in the right. So in any confrontation in the crossover, he should show that same tenacity.