Tybalt is a hot tempered, aggressive, and vengeful character in Romeo and Juliet. He is stormy right from the beginning of the play, and remains that way until his untimely death! Tybalt, Juliet's cousin, enters the play in Act I, Scene 1. Benvolio is trying to stop the Montagues and Capulet's from  fighting, but Tybalt is uninterested in peace making.

What, drawn, and talk of peace? I hate the word

As I hate hell, all Montagues, and thee.

Have at thee, coward!

Tybalt stabs Benvolio soon after they begin to fight. His wound is not fatal, however. Later in the play, Tybalt recognizes Romeo's voice at the Capulet masquerade and demands his uncle, Lord Capulet, remove Romeo from the party. When his uncle refuses to tell Romeo to leave, Tybalt plans to seek revenge upon Romeo. Tybalt sends a letter to the Montague house outlining his desire to have a duel with Romeo. When Romeo declines Tybalt's offer, Tybalt fights with Mercutio, Romeo's friend, and kills him. Furthermore, Romeo finds Tybalt and the two begin to sword fight. Tybalt is killed by Romeo as a result.