Information:

Romeo is son and heir of Montague and Lady Montague. He’s a handsome man of about sixteen who falls easily in and out of love demonstrating his immaturity. At the beginning of the play he is hopelessly in love with Rosaline but immediately falls in love with Juliet at first sight. However, Romeo proves his love through his integrity and actions and he secretly marries Juliet with the help of his friend and confident Friar Lawrence. Romeo is not interested in the on-going feud between his family and the Capulets, he is not a violent man. Tybalt tries to provoke Romeo into fighting him but, true to character, Romeo is not drawn in. However, when his close friend is killed by Tybalt, Romeo retaliates and kills Tybalt out of anger and frustration of one of his closest friends dying. 

Response:

I think that at the start of the movie/play Romeo is a naïve, immature character that falls in and out of love very fast. He also seems to take action on things very fast such as when he killed himself at the end even know that Juliet was still alive. However as the movie/play progresses he begins to mature and gain more courage than what he had before, example; he matures by instead of fighting with Tybolt he tries to break it up and bring peace between the two gangs; Capulets and Montagues.