What are the similarities and differences between Tybalt and Mercutio? What are the Similarities and Differences between Tybalt and Mercutio in...

To me, the main similarity between these two characters is
that they both kind of like violence.  Tybalt is always ready to fight.  His first words
and his last words in the play are about fighting.  He has to be restrained from going
after Romeo at the ball.  Mercutio also is kind of hot headed.  In the scene where he
dies, he cannot wait to get at Tybalt and fight him.

The
difference between them (at least so far as we can see in their words) is that Tybalt
has no thoughts except violent ones.  By contrast, Mercutio is funny -- as in how he
makes fun of the Nurse in Act II, Scene 4.  He also talks all kinds of silly stuff in
his "Queen Mab" speech in Act I, Scene 4.