Benvolio and Mercutio are a source of comic relief as well as wisdom in the play.
Explanation:
The pair is an unlikely one but they are friends and are there to help Romeo out. Benvolio often listens to his woes patiently while Mercutio makes harmless fun of it sometimes, but both characters present tidbits of wisdom for Romeo to follow.
When it comes to fighting for things however, Benvolio takes a step back as a pacifist while Mercutio steps up and fights.
