How should I revise my thesis concerning Banquo as Macbeth's foil in Macbeth?Banquo's true honor and morals cause him to be inherently good and...

A foil in literature shares some similarities with the
protagonist, but possesses characteristics that emphasize the opposite characteristics
in the protagonist. Although disagreement exists among some literary scholars, the most
common interpretation of Banquo's character is that he does serve as a foil to Macbeth
in the play. In regard to your thessis, you might consider opening it up a bit to be
less specific and more inclusive. Some
suggestions:

• Banquo's identity and personal
  character make him an effective foil to Macbeth.


• Because
  of Banquo's elevated social status and personal goodness, he serves as an effective foil
  to Macbeth.

With either of these thesis
statements, you can develop an essay that establishes and explains these points in
support:

• As the play begins, Banquo and Macbeth
  share equal power and position; they are both Scottish generals, valiant in battle and
  united in supporting King Duncan. (These are the similarities between them that later
  bring Banquo's character into contrast with Macbeth's.)
  


• Banquo's personal character is one of goodness that
  serves to emphasize Macbeth's evil. He lacks selfish personal ambition, turns away from
  evil, and remains loyal to King Duncan.

In
terms of Banquo's basic goodness, it might be interesting to note his relationship with
his son. He is a loving, protective father to Fleance. This trait in his character
perhaps emphasizes Macbeth's coldness and cruelty in ordering the slaughter of children,
all of Macduff's "pretty ones."

The links below will take
you to some helpful information. Good luck with your study!