Tybalt -- ready to live, kill or die for Honor!

Mercutio flames Juliet's cousin Tybalt -

Mercutio: "More than Prince of Cats. Oh he's the courageous Captain of Compliments. He fights as you sing prick-song -- keeps time, distance and proportion. He rests his minim rests -- one, two and the third in your bosom. The very butcher of a silk button, a duelist, a duelist! a gentleman of the very first house, of the first and second cause.... The pox of such antic, lisping, affecting fantasticoes."

Tybalt's personal side is nice enough for Juliet to genuinely mourn his loss as a friend.