I've been working on
this.
I downloaded a list of articles from Category: Characters from the Avatar Wikia, which is pretty much a comprehensive list of characters.
Then I've been trying to nail down culture, religion, birth and death dates using canon info where possible. The end goal is to implement each character from this spreadsheet using a script I will make.
Most of these characters will be courtiers at the Avatar Aang start date. I figured eventually even the minor characters should be added, so why not do them all at the same time.