Benvolio: Benvolio has similar traits to Mercutio in that he is greatly loyal to his family. He takes Romeo in under his wing, tries to cheer him after Rosaline refuses him, and stands by his side in his quest to find something to make his cousin happy. Another trait that makes Benvolio a round character can be seen after the deaths of Tybalt and Mercutio. When Lady Capulet assures the Prince that twenty Montague men were responsible for the death of Tybalt, Benvolio presents a nearly accurate representation of the events that had passed. Instead of being entirely honest, Mercutio makes it sound as if he had no ability to stop Romeo in his attack on Tybalt. Truthfully, he stood by and watched it happen. This shows us that he is not a liar, but he is self-preserving when the full truth would incriminate him as well.
Mercutio: Mercutio is a round character for many reasons. To begin, he is devoted and loyal. You can see this in his reaction to Tybalt’s insult of Romeo. He reacts passionately, violently, to protect his friend’s good name. This is especially true as Mercutio is killed in his efforts to stand for his friend. Earlier in the play, he will not take no for an answer from Romeo when he insists that his desperate, unrequited love for Rosaline makes him too miserable to attend the Capulet party. Mercutio forces him to attend and to acknowledge that love is foolish and that dreams are meaningless.