Here are some more good and short biographies of people from the Reformation:

Philip Melanchthon: The Gentle Lutheran – David Mathis (DG)

Wibrandis Rosenblatt: The Bride of the Reformation – Noel Piper (DG)

Wolfgang Capito: The Protestant Peacemaker – Rick Shenk (DG)

Menno Simons: The Fearless Pacifist – Ryan Griffith (DG)

Peter Martyr Vermigli: The Phoenix of Florence – Chris Castaldo (DG)