Other than Macbeth and Lady Macbeth, which character in Macbeth shows that people during this time could differentiate between good and evil?I...

In Macbeth, Banquo's character shows
the difference between good and evil.  In the first act, the witches foresee that
although Banquo will be "lesser" than Macbeth, he will also be "greater" and give birth
to a line of kings.  Later in the play, Banquo reflects upon the witches' prediction and
notes that all has come true for Macbeth.  Banquo wonders if and when the prediction
will also come true for him, but he is happy to just wait and see what will happen. 
Banquo fears that Macbeth has "played most foully" for his new titles, and Banquo
resolves that he will not stoop to such a low level to make his desires a reality.  So,
Banquo shows that he understands the difference between good and evil and more
importantly that he will not be tempted by the evil around him.