Final answer:
Shakespeare's development of the characters of Romeo and Juliet refines the central idea of the play by showcasing the consequences of hatred and the power of love.
Step-by-step explanation:
Shakespeare's development of the characters of Romeo and Juliet refines the central idea of the play by highlighting the consequences of hatred and the power of love. Through their actions and dialogue, Shakespeare shows how Romeo and Juliet's love challenges and ultimately transcends the deep-seated hatred between their families, the Montagues and Capulets. Their tragic fate serves as a cautionary tale, emphasizing the destructive nature of feuds and the potential for love to unite and transform.