Don Juan Tenorio is the main character in the play. He is a young man who chases thrills, which is best illustrated by the bet he makes with his friend to see who could do the most damage to others in a single year. Don Juan wins by dishonoring more women and killing more men; he admits that he does not believe in God's salvation and thus seeks his pleasure while he is alive. Don Juan is easily able to manipulate and charm others because he is charismatic, intelligent, and sneaky. Despite this, he does fall for Ines, a young woman he intends to marry who has been living in a convent. When he tells her father that he will change for her, though, Don Gonzalo refuses to accept it and instead rejects him. When he is rejected, he reverts to form and blames others for his problems; he kills Don Gonzalo and Don Luis. This puts him back on the path to reject God until Ines, dead because of Don Juan's actions, bargains her soul to save him. Don Juan still does not accept her offer of salvation until he is literally about to be dragged into Hell. He is stubborn, self-assured, and convinced of his own rightness even in the face of evidence that the ghostly apparitions he is seeing are real. When he finally accepts her, he is taken to Heaven with her and saved from Hell.
Dona Ines de Ulloa is the opposite of Don Juan. She loves God and seeks to please Him in her life; when she is brought to Don Juan's estate, she immediately wants to go to her father's house to preserve her virtue. She also loves Don Juan and wants to be with him. She is loyal enough that she is willing to bargain her soul with God to save Don Juan. She has one night to get him to accept salvation, or they will both be taken to Hell. Ultimately, she succeeds and the pureness of her soul cleans his own.
Don Luis Mejia is much like Don Juan. He also spent a year dishonoring women and killing men in order to win the bet. He did not achieve the same numbers and lost the bet but does not repent of his actions. He is also reckless, charming, charismatic, and pleasure-seeking. Despite his actions, he is enraged when Don Juan decides to try to seduce Ana, his fiancee. When he, like Don Gonzalo, rejects Don Juan's attempts to say he has changed, Don Juan stabs him, and Don Luis dies.
Don Gonzalo de Ulloa is the father of Ines. He is tricky and stern. He sneaks into the tavern where Juan and Luis meet to discuss their bet and hides from them so they will not know that they are being overheard. He is clever enough to realize his future son-in-law might hide his true character from him. Gonzalo is also honorable and loves his daughter deeply. He thinks to himself that he has to know because, though he is a gentleman, he is a father first. He goes to confront Don Juan and refuses to yield when Don Juan says he is a changed person.
Don Diego Tenorio is the father of Don Juan. He, like Don Gonzalo, is noble and intelligent. He sneaks into the same tavern to learn the truth of his son and hides so that it will not be kept from him. Once he knows the kind of man his son is, his honor compels him to use the family fortune and lands to create a graveyard where his son's victims can be buried.
Cristofano Buttarelli is the owner of the tavern where Don Luiz and Don Juan meet to discuss their exploits. He is driven by profit; he allows Don Gonzalo and Don Diego to hide in the tavern and listen to the conversation the two other men have. He thinks to himself that even though he has good wares, it does not matter that they are spending money for nothing as long as they are spending. He also admires Don Juan greatly, even though he sees the results of his evil misdeeds. He is not a moral person and clearly thinks of Don Juan as someone to look up to.
Marcos Ciutti is the servant of Don Juan. He appreciates the pleasures that serving the man gives him; he tells Buttarelli at the beginning that his own indulgences have been paid for by his master. He is also immoral; he is willing to help trick Ines and her attendant so that Don Juan can kidnap her to fulfill the terms of the second bet.