The Question and Answer section for We is a great resource to ask questions, find answers, and discuss the novel.
Which character is Zero?
Extripating the fancy is an operation remove the soul. No one had a soul... D503 did, though he didn't understand it. The one thing he did know, was that he didn't want anyone performing an operation while he was working on the rocket ship.
During the Day of Unanimity, which features elections, D-503 describes the power of being watched, which supports the theme of surveillance; he writes, "I see how everybody votes for the Benefactor and everybody sees how I vote for the Benefactor"...