Perhaps Uryu discovers an Arrancar who has a unique ability that could help him in his quest to understand the balance between Quincy and Hollow powers. Their relationship would be a journey of discovery for both of them. Uryu would have to overcome his initial hatred for Hollows while the Arrancar would need to trust a Quincy. They could exchange knowledge about their respective powers and cultures, which would be really fascinating to explore in a fanfiction.
One idea could be that Uryu, with his Quincy skills, is forced to team up with an Arrancar to fight a common enemy that threatens both their worlds. This could lead to a slow - building trust and friendship between them.
A possible plot could involve Ichigo being in a situation where he has to choose between his arrancar nature and his relationships with the harem. His arrancar side might be drawn to power and chaos, but his love for the harem makes him want to stay on a more moral path. This internal struggle could drive the story forward and also affect his relationships within the harem.
One plot idea could be that Naruto somehow gets transported to the world of Arrancars. He then starts to form relationships with different Arrancar characters, leading to a harem situation. Maybe he uses his ninja skills to protect them from other threats in their world, and in the process, they all fall for him.
Perhaps an Arrancar teams up with a Hogwarts student who is an outcast. They form an unlikely alliance. The student helps the Arrancar navigate the wizarding world, and in return, the Arrancar protects the student from bullies using its powers.
Well, a plot could involve a power - sharing situation. Maybe there's a power - draining curse in Hueco Mundo that affects both of them. In order to break it, they have to combine their powers in a way they never thought possible. This journey of trying to break the curse could make them see each other in a new light. They could also be involved in a mystery where they have to figure out who is behind a series of disappearances in their territory. Working together on this mystery could bring them closer.
One idea could be that Arrancar Ichigo has to protect Rukia from a new, powerful enemy in Hueco Mundo. Since he has Arrancar powers, he has a different fighting style and perspective, which could lead to some really intense battle scenes and a deeper understanding between them.
Another interesting concept is to create an arrancar OC who is an outcast among their kind. Maybe they have a unique power or appearance that makes the other arrancars shun them, and they have to find their place in the world.
Neliel could be a great choice. She has a more gentle and kind nature compared to many other Arrancars. Her unique appearance and backstory would make for an interesting dynamic with Uryu. She could potentially teach Uryu about the different aspects of Arrancar existence that he may not be aware of.
Well, you could create an Arrancar OC that was once a human with a strong sense of justice. After becoming an Arrancar, they struggle with their newfound powers and the need to follow Aizen's orders. They might secretly help the Soul Reapers in some ways. Or perhaps an Arrancar OC with a power that is based on sound. They can use high - pitched frequencies to shatter objects or low - pitched ones to paralyze opponents. Also, an Arrancar who is an outcast among their own kind because they have a different view on the war between Soul Reapers and Arrancars could make for an interesting fanfiction.
Another plot might involve Uryu being turned into a vampire against his will. Ichigo then has to find a way to either cure him or help him control his new vampiric urges. This would lead to a lot of emotional turmoil and character development for both of them.
A plot where 707 and MC get trapped in a virtual world that is a distorted version of their own reality. They need to find a way to escape by solving puzzles and relying on each other's unique skills. For example, 707's hacking abilities could be crucial in finding glitches to break free.