Egeria Lusk is one of my favorite characters. She owes a bit to Patience from His Robot Girlfriend. For one thing, she is extremely smart—the smartest person in the colony with the possible exception of Professor Calliere. For another, she is attracted to a much older man. She is 27 and has determined to marry Zeah, who is 49. She appears later in the series too, but Book 1 is really her spot.