Are you talking about Jesus Christ?
You're right, God doesn't need a son. But we need a Saviour. And God loves YOU AND ME. So he came in the form of a man to demonstrate His love to us. God came near. He isn't far. He came for you and me in the life and death and resurrection of Jesus Christ. Jesus took the punishment of all our sins and wrongs. Instead of us getting the punishment, He took it for us. So instead of us having to earn our salvation (which no man can do), God made a way so that we can be reconciled to Him. None of our good works can save us and restore us. Only Jesus (who is God) made the way for us to be saved and to be made a new person. Free from sin, from self, from man-made religion - and free in God through Jesus, in love, hope and truth.
'For God so loved the world that He sent His one and only Son Jesus Christ, that whoever believes in Him shall not die but have everlasting Life.'
~ J a n i e ll e