Another concept could be the origin story of Dark Ichigo within the fanfiction world. It might be different from the original manga or anime, like Dark Ichigo being a result of an ancient curse that the OC is somehow involved in. This could lead to a whole new plotline where Ichigo has to not only deal with his inner Hollow but also the mystery behind it.
Some fanfictions might explore the idea of Dark Ichigo having a more sentient and independent existence outside of Ichigo. The OC could play a role in either befriending or fighting this more independent Dark Ichigo. It could be that the OC has a connection to the Hollow world that allows them to interact with Dark Ichigo on a different level.
In some ichigo x hollow ichigo fanfiction, the exploration of their shared identity is really fascinating. They are two parts of the same whole, and fanfictions might delve into how they come to terms with that. Maybe they learn to co - exist in a new way that neither of them expected, leading to new character development for Ichigo as a whole.
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.
Obviously, Ichigo and Dark Ichigo are the central characters. Ichigo, with his complex personality and powers, is always a key figure. Dark Ichigo, being his inner Hollow, brings a lot of drama and conflict. The OC also becomes popular depending on how well - written they are. If the OC has unique powers or a really interesting backstory, they can gain a following among fans of the fanfiction.
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 how the powers of Naruto and Ichigo blend in the reincarnation. For example, Naruto's chakra control might interact with Ichigo's reiatsu in unique ways. Maybe the Sharingan could have a new form when combined with Ichigo's Hollow powers. Another concept could be the characters' relationships. How would Naruto's friends react to Ichigo's presence? And vice versa, how would Ichigo's allies view Naruto? It could also explore new storylines in the Naruto or Bleach universes that are affected by this reincarnation, like new villains emerging or old ones having different motives.
Well, in 'bleach ichigo the gamer fanfiction', there could be the idea of Ichigo having access to in - game inventory. He could store his zanpakuto or other items in this virtual inventory and retrieve them instantly during fights, which would be really cool and change the way battles are fought.