Romeo - The son and heir of Montague and Lady Montague. A young man of about sixteen, Romeo is handsome, intelligent, and sensitive. Though impulsive and immature, his idealism and passion make him an extremely likable character. He lives in the middle of a violent feud between his family. and the Capulets, but he is not at all interested in violence. His only interest is love. Source: https://www.sparknotes.com/shakespeare/romeojuliet/character/romeo/
Juliet - The daughter of Capulet and Lady Capulet. A beautiful thirteen-year-old girl, Juliet begins the play as a naïve child who has thought little about love and marriage, but she grows up quickly upon falling in love with Romeo, the son of her family’s great enemy. Because she is a girl in an aristocratic family, she has none of the freedom Romeo has to roam around the city, climb over walls in the middle of the night, or get into swordfights. Nevertheless, she shows amazing courage in trusting her entire life and future to Romeo, even refusing to believe the worst reports about him after he gets involved in a fight with her cousin. Juliet’s closest friend and confidant is her nurse, though she’s willing to shut the Nurse out of her life the moment the Nurse turns against Romeo. Source: https://www.sparknotes.com/shakespeare/romeojuliet/character/juliet/
Review of each character's role in the play including defining quotes and character motivations for all major characters. Source: http://absoluteshakespeare.com/guides/romeo_and_juliet/characters/characters.htm
Critical essay by influential Shakespeare scholar and commentator William Hazlitt, discussing all you need to know on the characters of Romeo and Juliet. Source: https://ebooks.adelaide.edu.au/h/hazlitt/william/characters-of-shakespeares-plays/chapter12.html