I'm the author of the ASHFALL three-and-a-half-ology: ASHFALL, ASHEN WINTER, SUNRISE, and DARLA'S STORY.
I'm rereading my own books, building a database of character facts and traits as I go. I got about 25,000 words into ASHFALL #4 before I realized that I don't know my minor characters well enough to continue the series. Rereading my own work is kind of painful--I want to edit it, but obviously I can't. I'm one of those perfectionists who quits editing only when someone rips the manuscript out of my hands.