Who is the protagonist in "Stranger than Fiction"

In "Stranger than Fiction", there was a protagonist and antagonist. The protagonist was Harold Crick. Harold went through the day doing his daily routines. He began to feel that someone was watching him or following him and noting everything he did during the day, down to the amount of brush stokes he used to brush his teeth. He eventually came to find out that a world known author was writing a novel and happened to be about his life.