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In Shakespeare's play, Romeo and Juliet, Tybalt and Benvolio are very different characters. Tybalt is a hot head. He is always looking for a fight. Mercutio refers to him as the King of the Cats, inferring that he has nine lives—perhaps that he is lucky that his poor disposition has not cost him is life. However, comparing him to a cat also infers that Tybalt is sly and sneaky, which proves to be the case when Mercutio and Tybalt fight.
Tybalt is also something of a spoiled child. At the masquerade where Romeo and Juliet meet, Tybalt recognizes Romeo's voice, and because the two families are feuding, Tybalt goes to Capulet, expecting the older man to throw Romeo out. Surprisingly, Capulet does not. Tybalt starts to have a tantrum, but Capulet cautions him:
Content thee, gentle coz, let him alone, / A bears him like a portly gentleman; / And, to say truth, Verona brags of him / To be a virtuous and well-governed youth. / I would not for the wealth of all this town / Here in my house do him disparagement.
Capulet goes on to tell Tybalt to be patient and calm down. He also says that if Tybalt honors Capulet, he will do as he asks, or he will leave the party. And so Tybalt, showing himself to be rash and uncontrollably disdainful of Romeo, leaves.
Benvolio, on the other hand, is the great peacemaker of the play. He is forever trying to keep others from fighting. Whereas Tybalt is always ready for a fight, it is Benvolio that hopes to lead others to quiet resolution. At the start of the play, Benvolio tries to stop an altercation between Capulet and Montague servants. He places himself between them, when Tybalt appears, accusing Benvolio of fighting. Benvolio denies this and tries to explain:
I do but keep peace; put up thy sword, / Or manage it to part these men with me.
Benvolio says that his is trying to break up a fight. He tells Tybalt to put his sword away or use it to break up the confrontation. Instead, Tybalt calls Benvolio a coward and attacks him; Bevolio defends himself.
By comparison, we see that Tybalt is an angry young man, always looking for a fight, while Benvolio is a young man who does his best to promote peace.