Dark Half

Every day, the knight Falco stands guard over humanity. Every night, the Fallen, awakened after a thousand-year sleep, roams the earth, collecting the souls of mortals. It is up to you to control both characters. From time to time the plot (quite good, by the way) will put the player in front of the choice between good and evil, sometimes quite obvious, and sometimes - not so unambiguous. There is a full English translation of the game by AGTP.