Sophie is a stunningly beautiful 12-year-old girl from the village of Gavaldon. She loves pink, focuses heavily on her skincare routine, and performs calculated good deeds to attract the attention of the School Master. Believing she is destined to be a fairy-tale princess, she eagerly anticipates being kidnapped. Upon placement in the School for Evil, she fiercely maintains she belongs in Good and works relentlessly to correct what she views as a mistake.

Agatha is a 12-year-old girl who lives in a Gavaldon cemetery with an anti-social cat. She favors black clothes, carries matches in her pockets, and feels entirely out of place in her village. She desires only an ordinary life and rejects the concept of fairy tales completely. When kidnapped alongside her friend, she ends up in the School for Good, where she feels mismatched among the beautiful princesses and focuses purely on finding a way home.

Tedros is the son of King Arthur and a prominent prince at the School for Good. He excels at chivalry and sword fighting, easily outperforming his peers physically. Haunted by his father's romantic failures with Guinevere, he desperately wants a girl who appreciates his inner character rather than his royal status or muscles. He attempts to uphold the ideals of a fairy-tale prince but struggles with his own biases regarding what a princess should look and act like.

The School Master is a mysterious, shadowy figure who kidnaps two 12-year-old children from Gavaldon every four years to deposit them into the School for Good and Evil. Operating from a sealed tower, he observes the students and protects the Storian, a magical pen that writes the children's fairy tales. He communicates in riddles and maintains strict rules about the balance between the two schools.

Hester is a student at the School for Evil who shares Room 66 with her new roommates. She embraces her villainous role and possesses a magical demon tattoo that she can summon from her body to attack others. Ambitious and quick to anger, she desires to be the Evil Captain and views any competition as a threat to be eliminated.

Dot is a student placed in the School for Evil who shares a room with a hostile group of girls. She has a strong affinity for chocolate and possesses the magical talent to turn objects into sweets. Unlike her peers, she exhibits kindness and struggles academically in her villainous classes, leading to constant bullying and isolation from her roommates.

Beatrix is the unofficial leader of the Evergirls at the School for Good. She represents the stereotypical ideal of a fairy-tale princess with her traditional beauty and focus on securing a prince. She actively targets students who do not fit the mold and makes it her primary mission to win the affections of the most desirable boy in school.

Anadil is a student at the School for Evil residing in Room 66. She aligns closely with the malicious atmosphere of the school and frequently partners with the more aggressive students to plan attacks or secure high rankings. She keeps pet rats and participates in the intimidation of weaker students.

Professor Dovey is the Dean of the School for Good. She teaches classes on good deeds and moral predicaments, working to instill honor and valor in her students. She challenges the superficial beliefs of her pupils, attempting to teach them that true goodness comes from inner character rather than physical appearance.

Lady Lesso is the Head of the School for Evil who teaches curses and death traps. She takes a harsh, unsympathetic approach to education, demanding that her students embrace true malice. She lectures on the necessity of destroying one's nemesis and shows extreme favoritism toward students who demonstrate authentic cruelty.

Hort is a weaselly looking boy placed in the School for Evil. He attempts to fit in with the villains and participates in early bullying exercises, but frequently ends up on the losing end of magical confrontations. He develops an unreciprocated fixation on the most beautiful girl in his school.

Professor Sader is a blind history teacher and seer at the School for Good and Evil. He instructs students on the origins of the institution and the Great War between the two founding brothers. He possesses the ability to move between the fairy-tale world and the real world, carrying knowledge of the students' pasts and potential futures.

Kiko is a gentle and emotional student at the School for Good. She attempts to survive the highly competitive environment of the Evergirls while maintaining a friendly disposition toward outcasts. She frequently cries when overwhelmed by the social pressures of the school.

Tristan is a boy at the School for Good who trains in chivalry and sword fighting. He participates in the social dynamics of the Everboys and follows the lead of the more prominent princes, though he maintains his own interests in the school's social events.

Princess Uma is a professor at the School for Good who teaches animal communication exclusively to the girls. She instructs her students that those who fail to become princesses will become animal henchmen. She advises her pupils to focus entirely on securing a prince.

Castor is the bad-tempered, dog-headed half of the school's two-headed guardian. He handles disciplinary actions and specific class lessons, barking orders and enforcing the strict separation of the two schools.

Pollux is the good-tempered, dog-headed half of the school's two-headed guardian. He attempts to explain the rules calmly to the new arrivals and emphasizes the importance of trusting the established system to protect the balance of their world.

Yuba The Gnome is the instructor for the surviving fairy tales class, which is the only course where students from both schools interact. He takes the students into the dangerous Blue Forest and forces them to use magic to disguise themselves and identify their enemies.

Grimm is a magical creature sidekick assigned to assist a villain. Armed with a bow and arrows, he is relentless in attacking designated targets and follows orders with silent, violent dedication.

Professor Anemone is a teacher at the School for Good who instructs the girls on beautification, specifically focusing on how to make their smiles kinder. She enforces traditional princess etiquette and punishes those who step out of line or fail to visualize a prince.

The Beast is a creature with a human body and a wolf's head who operates the Doom Room. He tortures rule-breakers by chaining them to walls and cutting off their hair, serving as the ultimate physical punishment in the School for Evil.

Agatha's Mom lives in the cemetery in Gavaldon. She desires her daughter to leave their village to make something of herself, viewing Agatha's lack of ambition and reliance on her best friend as personal flaws.

Sophie's Father is a villager in Gavaldon who attempts to protect his daughter from being kidnapped. Despite his efforts to keep her safe, his daughter actively works against him to leave the village.

Reena is an Evergirl who follows the popular clique at the School for Good. She places a high value on her physical appearance and panics when her beauty is threatened by magical combat.

Millicent is a student at the School for Good who associates with the popular Evergirls. She shares their superficial values and relies on traditional fairy-tale beauty as her primary source of confidence.

Chaddick is an Everboy who trains alongside the school's top prince. He serves as a loyal friend and soldier, ready to defend his school with a bow and arrow when conflicts arise.