The whole concept of Ichigo manifesting more than one sword opens up a structural can of worms the canon carefully avoided. His dual blades in the 'Fullbringer' arc are still one entity—White, his Hollow-Zanpakutō spirit. Most fics that give him distinct, separate Zanpakutō end up creating a narrative imbalance. A second blade implies a second spirit, a second soul fragment. So you get awkward questions: does Old Man Zangetsu split? Does White get a counterpart? Suddenly, the entire thematic weight of his hybrid identity being a single, volatile, unified force gets diluted into a committee. The conflict isn’t just power-scaling; it’s philosophical. His character arc is about integrating competing legacies into a single self. Adding a separate sword often feels like the author wants to give him a cool accessory without dealing with the messier consolidation his journey represents. I’ve dropped fics where he wields, like, a ‘light’ Zangetsu and a ‘dark’ one—it just turns his internal struggle into a bland external toolset.
That said, when it’s done with thought, the conflicts can be gripping. I read one where the ‘second blade’ was actually the lingering manifestation of his Quincy powers, physically separate and constantly arguing with his Hollow side. The conflict wasn’t about more power, but about his soul being literally torn three ways during Bankai. He’d freeze in battle because the spirits couldn’t agree on a single form. The real struggle was forcing them to cooperate, not mastering a new technique. Those stories work because the extra sword isn’t a bonus; it’s a symptom of a deeper fracture.