What is a character used to point out the strengths and weaknesses of another character

The foil character is used to highlight some particular quality or qualities of the main character. A subplot can also work as a foil to the main plot. The foil subplot highlights some key aspects of the main plot by showing an opposing situation.

b. and i with my fighting heart, i thought at

first / to steal up to him [the cyclops].   the cyclops’ actions first odysseus to take

action after killing his men and trapping in the cave revealed his intent of

doing them harm.   that is why odysseus

blinded him to enable him and his men to escape.

the power of