Her creation of the 'indigo' children of Meg and Calvin and Charles Wallace is delightful to watch develop. They are different from my characters (Andy, Roger, and Miranda) in their cultural setting, but their essence and their complete openness to new ideas are very similar.
Some of my favorite lines so far:
"I don't understand it any more than you do, but one thing I've learned is that you don't have to understand things for them to be."
"What's a megaparsec?" Calvin asked.
"One of father's nicknames for me," Meg said. "It's also 3.26 million light years."