Book of Jeremiah
Jeremiah Chapter 1, verses 1 to 3 says that the book is "the words of Jeremiah son of Hilkiah". Jeremiah is seen clearly as a real person, talking to his scribe Baruch about his role as a servant of God who had bad news for the people. His book is a message to the Jews in exile in Babylon, saying that the disaster of exile is God's response to Israel's pagan worship.  The people, says Jeremiah, are like an untrue wife and children who act badly.  This made God punish them, but He will also welcome them back if they change their ways.