Question

impulsive, emotional romeo acts as a character foil for
rosaline, who is unloving and cold.
capulet, who is stern and protective.
nurse, who is wise yet funny.
paris, who is stable yet dull.

Explanation:

A character foil is a character who contrasts with another character (usually the protagonist) to highlight certain traits. Impulsive and emotional Romeo contrasts with Paris who is stable yet dull.

Answer:

Paris, who is stable yet dull.