The Calibre
WordDumb plugin creates Kindle X-Ray files, which allow you to view general information about character, places, and other entities in a book. It is able to pull this information from
*.fandom.com sites and from
Wikipedia, which it then copies onto a Kindle devices alongside the book file.
It's also able to pull word definitions from Wiktionairy, and possibly local sources.
See a sample of how this looks on the right site of this image:
https://user-images.githubuserconten...0018124040.png