Board Thread:Questions and Answers/@comment-4990614-20140908225030/@comment-25238518-20140909015439

Since Parasite Eve was first published in 1995, it wouldn't be surprising for Kamachi Kazuma to have had his hands on the series at some point. Aside from their basis in the science-fiction genre, the characters in each respective series don't seem to influence each other.

As far as similarities in plot progression, I don't see any of these. The additional horror elements aren't present through too much of Index, though Accelerator eating a human ear is very graphic.

They both seem to be well-liked successes in the Japanese sci-fi genre, but beyond that, the extent of influence Parasite Eve could have on Index would only be that Kazuma had read the series at one point and it influenced his writing style in some minor way. I'm glad you've been exposed to both of these series.