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Reddit user duddles - who runs the outstanding Bookmarking Colors Tumblr - took the Amazon eBooks of the novels and plotted out each character mention over time.
It's a really great achievement. Fans of the books can find when characters were first introduced, when they became important, and even when they die or exit the plot.
Duddles gave us permission to reprint the charts.
Blue represents our core three protagonists. Green represents allies. Brown characters are sympathetic adults, and red characters play an antagonistic role. Black characters comprise supporting cast members.
Obvious spoilers follow.
Check them out: