Who is Daniel from Microserfs and what is their importance?

Daniel is the narrator of the story. He writes a daily journal, which sometimes has long periods between entries depending on whether he has something humorous and/or important to record. He suffers over the loss of his younger brother, Jed, and at times sees people who look exactly like him. Early on in the story, Daniel starts a relationship with Karla. He chronicles the development of their love while working for Microsoft and later for Michael's company, Interiority.