human
Subaru:  "What a hopeless idiot…but…" His stupidity had been fatal, but it had also revealed certain truths. This may have come naturally to the other Natsuki Subaru, but it was something the current Natsuki Subaru had not known. —For example, how had he gained the power of Return by Death? If this was a classic isekai story, then there should have been a god or some other supernatural being that summoned him. But if the old Natsuki Subaru didn’t have any memories of meeting a supernatural being, then it made sense why he didn’t remember receiving the power or being aware it existed. In his final moments, the other Natsuki Subaru had been convinced that he’d died for real. Or at least that’s how it felt to me. —And as he had that thought, Subaru suddenly realized something. I can’t objectively differentiate between myself and the other Natsuki Subaru in any meaningful way.
gpt
Subaru:  "I’m even more mixed-up than when I read Meili’s book…" When he’d dived into her book of the dead and gone through the moments of her life, he had experienced something like an intense gravitational pull that dragged him into her mind. Part of his personality had merged with hers and created a Meili that took up residence in his head, saying whatever she wanted and generally driving him crazy. On some level, he knew that it was a figment of his imagination and had nothing to do with the real Meili. Even then… "" There were obvious differences between his experience with Meili and what he was going through now. The primary reason was probably because the subject this time was himself. A version of him that wasn’t actually him. This was an impossible situation that was pushing him into an unexpected battle with himself. A battle with myself… It was a hackneyed turn of phrase, but it perfectly described the situation Subaru found himself in. Honestly, it wasn’t looking good. Subaru’s consciousness was being inextricably drawn into the other Natsuki Subaru.
human
Subaru:  "—Emilia. Emilia, Emilia, Emilia, Emilia, Emilia." Subaru could feel himself being blotted out, so he chanted her name like it was a powerful spell. The reason for that was simple—the Natsuki Subaru in the book of the dead didn’t know her as Emilia. He had played the fool until the very end, never doubting the fake name he had been given. That was a difference between the current Subaru and his other self. Still terrified by the feeling of being whittled away, he gritted his teeth and looked down at his feet.
gpt
Subaru:  The book that he had dropped was lying there. He had watched the old Natsuki Subaru die once. It was odd to think back on it, as the book had started with the moment he first came to this world, the moment he had shouted like a moron about how the world was so different. With Meili’s book, it had started with her first memories—not that it changed much.