In his book Why Should Anyone Believe Anything At All, James Sire recommends the following books on The Character of Jesus Christ:
The Gospels of Mathew, Mark, Luke and John
Jesus Christ: The Witness of History, by Norman Anderson
Between Heaven and Hell, by Peter Kreeft
Socrates Meets Jesus, by Peter Kreeft
Understanding Jesus, by Alister McGrath
Meeting Jesus, by James Sire
Basic Christianity, by John Stott
The Christology of Jesus, by Ben Witherington, III
Jesus and the Victory of God, N.T. Wright
Who Is Jesus?, by N.T. Wright