What to read after Notre-Dame de Paris?

Quasimodo is the bell-ringer of Notre Dame and a barely verbal and half-blind hunchback. Ringing the church bells has made him deaf. Abandoned by his mother as a baby, he was adopted by Claude Frollo. Quasimodo's life within the confines of the cathedral and his only two outlets — ringing the bells and his love and devotion for Frollo — are described. He ventures outside the Cathedral rarely, since people despise and shun him for his appearance. The notable occasions when he does leave are his taking part in the Festival of Fools — during which he is elected the Pope of Fools due to his perfect hideousness — and his subsequent attempt to kidnap Esmeralda, his rescue of Esmeralda from the gallows, his attempt to bring Phoebus to Esmeralda, and his final abandonment of the cathedral at the end of the novel. It is revealed in the story that the baby Quasimodo was left by the Gypsies in place of Esmeralda, whom they abducted.
Esmeralda (born Agnes) is a beautiful young Gypsy street dancer who is naturally compassionate and kind. She is the center of the human drama within the story. A popular focus of the citizens' attentions, she experiences their changeable attitudes, being first adored as an entertainer, then hated as a witch, before being lauded again for her beliefs will rightly protect her but who simply wants to seduce her. She is one of the few characters to show Quasimodo a moment of human kindness, as shown when she gives him water after the hunchback's flogging. She is eventually revealed to not actually be a gypsy, but was abducted by them and was replaced with the deformed Quasimodo.
Claude Frollo, the novel's main antagonist, is the Archdeacon of Notre Dame. His dour attitude and his alchemical experiments have alienated him from the Parisians, who believe him a sorcerer. His parents having died of plague when he was a young man, he is without family save for Quasimodo, for whom he cares, and his spoiled brother Jehan, whom he attempts to reform towards a better life. Frollo's numerous sins include lechery, failed alchemy and other listed vices. His mad attraction to Esmeralda sets off a chain of events, including her attempted abduction and Frollo almost murdering Phoebus in a jealous rage, leading to Esmeralda's execution.
Jehan Frollo is Claude Frollo's 16-year-old over-indulged younger brother. He is a troublemaker and a student at the university. He is dependent on his brother for money, which he then proceeds to squander on alcohol. Quasimodo kills him during the attack on the cathedral. He briefly enters the cathedral by ascending one of the towers with a borrowed ladder, but Quasimodo sees him and throws him down to his death.
Phoebus de Chateaupers is the Captain of the King's Archers. After he saves Esmeralda from abduction, she becomes infatuated with him, and he is intrigued by her. Already betrothed to the beautiful but spiteful Fleur-de-Lys, he wants to lie with Esmeralda nonetheless but is prevented when Frollo stabs him. Phoebus survives but Esmeralda is taken to be the attempted assassin by all, including Phoebus himself. He is later married to Fleur-de-Lys and is miserable.
Fleur-de-Lys de Gondelaurier is a beautiful and wealthy socialite engaged to Phoebus. Phoebus's attentions to Esmeralda make her insecure and jealous, and she and her friends respond by treating Esmeralda with contempt and spite. Fleur-de-Lys later neglects to inform Phoebus that Esmeralda has not been executed, which serves to deprive the pair of any further contact—though as Phoebus no longer loves Esmeralda by this time, this does not matter. The novel ends with their wedding.
Pierre Gringoire, the novel's protagonist, is a struggling poet. He mistakenly finds his way into the "Court of Miracles", the domain of the Truands. In order to preserve the secrecy, Gringoire must either be killed by hanging, or marry a Gypsy. Although Esmeralda does not love him, and in fact believes him a coward rather than a true man — unlike Phoebus, he failed in his attempt to rescue her from Quasimodo — she takes pity on his plight and marries him. But, because she is already in love with Phoebus, much to his disappointment, she will not let him touch her.
Sister Gudule, formerly named Paquette la Chantefleurie, is an anchoress, who lives in seclusion in an exposed cell in central Paris. She is tormented by the loss of her daughter Agnes, whom she believes to have been cannibalised by Gypsies as a baby, and devotes her life to mourning her. Her long-lost daughter turns out to be Esmeralda.
Louis XI is the King of France. Appears briefly when he is brought the news of the rioting at Notre Dame. He orders his guard to kill the rioters, and also the "witch" Esmeralda.
Tristan l'Hermite is a friend of King Louis XI. He leads the band that goes to capture Esmeralda.
Henriet Cousin is the city executioner, who hangs Esmeralda.
Florian Barbedienne is the judge who sentences Quasimodo to be tortured. He is also deaf.
Jacques Charmolue is Frollo's friend in charge of torturing prisoners. He gets Esmeralda to falsely confess to killing Phoebus. He then has her imprisoned.
Clopin Trouillefou is the King of Truands. He rallies the Court of Miracles to rescue Esmeralda from Notre Dame after the idea is suggested by Gringoire. He is eventually killed during the attack by the King's soldiers.
Pierrat Torterue is the torturer who tortures Esmeralda after her interrogation. He hurts Esmeralda so badly she falsely confesses, sealing her own fate. He was also the official who administered the savage flogging awarded to Quasimodo by Barbedienne.