At the beginning Romeo always acts peculiarly, a mysterious way, he also fights all the time, he has superficial feelings (For example, love for Rosaline). But then when he sees Juliet, he starts to feel real love a more profound love, which had to change him to make him weaker and "a fool of love." He is a passionate man through all the play
In the beginning, we see Juliet as an innocent, dutiful and inexperienced child. The first meeting between Romeo and Juliet is a defining time in Juliet's life, after that moment we see a more mature and practical Juliet, she suddenly speaks with great naturalness, her vision and understanding of love are different. In the end, Juliet shows herself focus on Romeo and in her love for him. Her passion makes her choose death rather than living in a world without Romeo.