Yes, three or four. The most significant character to be upgraded was Mallory Greenstock. In the original draft, she filled a merely clerical role as an unnamed lawyer in the U.S. Attorney's Office, serving as a go-between in chapter 3 to pass along Romo Malbonum's offer to plead guilty. But she kept kicking the author in the frontal cortex (and wherever else subconscious prods can be felt) and eventually, as a reward for her effrontery, was furnished a name and retrofitted into parts of the manuscript that were already in draft at the time she was promoted to central character status.