Mercutio is a very supportive and open character in the play. She is trying to help Romeo, and she is always on his side. In act 1 scene 4 p.198-199, lines 55-95. Mercutio tries to show Romeo that he does not need to focus on his weaknesses, but that he needs to focus more on his strengths, she also is trying to veer him away from the idea of thinking too much about his dreams. Because she is stating  its about how the queen gallops. Mercutio is a very good friend to Romeo!!!