Nebuchadnezzar in Daniel 1-3
At the end of Daniel 1, Nebuchadnezzar is impressed:  "At the end of the time set by the king to bring them in, the chief official presented them to Nebuchadnezzar.  The king talked with them, and he found none equal to Daniel, Hananiah, Mishael and Azariah; so they entered the king's service.  In every matter of wisdom and understanding about which the king questioned them, he found them ten times better than all the magicians and enchanters in his whole kingdom."
At the end of Daniel 2, Nebuchadnezzar honors Daniel and his God--in that order--and places Daniel in a high position.  "The king said to Daniel, 'Surely your God is the God of gods and the Lord of kings and a revealer of mysteries, for you were able to reveal this mystery."
At the end of Daniel 3, Nebuchadnezzar says to Shadrach, Meshach and Abed-nego, "Praise be to the God of Shadrach,Meshach and Abed-nego, who has sent his angel and rescued his servants!  They trusted in him and defied the king's command and were willing to give up their lives rather than serve or worship any god except their own God.  Therefore I decree that the people of any nation or language who say anything against the God of Shadrach, Meshach and Abed-nego be cut into pieces and their houses be turned into piles of rubble, for no other god can save in this way."
God was more merciful to Nebuchadnezzar than Nebuchadnezzar would have been as we learn in Daniel 4.