Shinji did use his Bankai in the manga. It was a crucial moment that turned the tide of the fight. The Bankai's power and unique abilities were showcased, adding an exciting element to the story.
Since I'm not very familiar with specific 'Shinji Bankai' light novels, generally, light novels often have unique characters. Maybe in these novels, the characters related to 'Shinji Bankai' have distinct personalities and abilities.
I'm not sure which specific 'Shinji Bankai' light novels there are. You could try searching on major e - book platforms or specialized Japanese literature websites.
Rukia would probably be very critical at first. Since she is quite serious, she might nitpick the inaccuracies in the fanfiction. But she might also secretly enjoy the ones that show her in a positive light, like those highlighting her friendship with Ichigo. In the Bleach universe, characters are used to their own stories, and fanfiction would be a whole new and unexpected take on their lives. The zanpakuto spirits might also have interesting reactions if they could read, as they have their own personalities and might be offended or flattered by how they are depicted in the fanfictions.
Character insights. When a fanfic focuses on the characters' reactions, it allows readers to see deeper into their personalities. For example, seeing how Ichigo reacts to a new Hollow threat in a different way than in the original story can be very captivating.
Naruto might use Bankai in a more physical and direct way compared to Bleach characters. Since Naruto is used to combat with his body and chakra - enhanced attacks, his Bankai could be more like a physical transformation rather than the more spiritual manifestations in Bleach. For example, instead of a spectral form, his Bankai could be a physical enhancement of his body with the Zanpakuto's power.
Sure. 'A New Perspective' is a great bleach reaction fanfic. It offers unique insights into the characters' reactions to various events in the Bleach universe. The character development in it is quite interesting as it makes you see the well - known characters in a different light.
Yes, they probably would. Ichigo might blush if he reads a fanfiction about his romantic relationships. He's not really the type to be open about such things, so it would be an embarrassing experience for him.