Name: Rin Okumura Gender: Male Age: 15 A boy born as the scion of Satan, inheriting both human and demon blood. He was raised by Shiro Fujimoto alongside his twin brother, Yukio. While he struggles with academics and is quick to pick a fight—possessing a rough exterior—he is bright, straightforward, and kind-hearted at his core. Following the loss of his foster father, Shiro, he aims to become an Exorcist to protect people from demons. Training as a Page at the Exorcism Cram School, he fights using the "Kurikara," a demon-slaying sword that seals his demonic heart, and the blue flames inherited from his father, Satan.

Name: Yukio Okumura Gender: Male Rin Okumura's twin brother. Possessing a serious and kind personality, he has looked after his older brother since they were children. A prodigy who underwent training to become an Exorcist from a young age, he obtained his qualification as the youngest in history. He currently serves as an instructor at the Exorcism Cram School, teaching Anti-Demon Pharmacology. His future goal is to become a doctor. While calm, composed, and possessing a strong sense of responsibility along with a brilliant mind and high combat ability, he is often strict with his brother, Rin.

Name: Shiemi Moriyama Gender: Female A girl from the Exorcist supply shop "Exorcist Supplies Moriyama," where Yukio works. She loves tending to flowers and plants and has a gentle, kind-hearted personality. She can be a bit airheaded and naive, and is shy and socially awkward. Having spent her childhood mostly with her grandmother, she isn't very familiar with the outside world. Driven by a desire to change herself, she begins attending the Exorcism Cram School, where she meets Rin and Yukio. She has extensive knowledge of plants and grows little by little through her interactions with her friends.

Name: Ryuji Suguro Gender: Male The heir to a prestigious temple in Kyoto. A Page at the Exorcism Cram School, he is a hardworking, serious student with excellent grades. Despite his sharp gaze and delinquent-like appearance, he actually has a strong sense of responsibility and cares deeply for his friends. He tends to get emotional and often clashes with Rin, but at his core, he is a dependable, big-brother type who looks after others. He aims to become a first-class Exorcist to protect his family and comrades. He is a reliable person who hates losing and spares no effort in his training.

Name: Renzo Shima Gender: Male A boy with striking pink hair. He comes from the same temple as Ryuji Suguro's father and has been friends with Ryuji since childhood. A Page at the Exorcism Cram School, he often hangs out with Ryuji and the others. He is bright, social, and a lighthearted mood-maker, but he dislikes troublesome or formal things. He loves women and is proactive about talking to girls. While he usually acts aloof and carefree, he actually hides unexpected depths and true ability.

Name: Mephisto Pheles Gender: Male A mysterious man who claims to be a friend of Shiro Fujimoto. An Honorary Knight of the True Cross Order, he is the one who guided Rin onto the path of an Exorcist. Publicly, he serves as the Chairman of True Cross Academy. Characterized by his flamboyant clothing and unique way of speaking, he never loses his air of composure. He is elusive and whimsical, often toying with those around him with joking remarks. His true identity is that of a demon, making him a key figure deeply involved in both the human and demon worlds. He hides unfathomable power and many mysteries.

Name: Arthur Auguste Angel Gender: Male An Exorcist working at the Vatican Headquarters who currently holds the title of Paladin. He occupies a high position within the True Cross Order and is Shura's direct superior. He has a strict personality that values discipline and harbors strong hostility toward demons. Possessing superior skills as an Exorcist, he places great importance on his responsibilities and mission as the Paladin. He approaches his duties with a calm and dignified attitude and is one of the most powerful individuals representing the True Cross Order.

Name: Shiro Fujimoto Gender: Male The foster parent of Rin and Yukio Okumura and the priest of the Southern Cross Monastery. A man of exceptional skill as an Exorcist, he once held the title of Paladin. He was boisterous and caring, with a generally cheerful and approachable personality. He raised Rin and Yukio with as much care as if they were his own flesh and blood. Although he was possessed by Satan, he risked his life to resist in order to protect Rin. To the two brothers, he is an irreplaceable father.

Name: Konekomaru Miwa Gender: Male A disciple of Ryuji Suguro's father who grew up as a childhood friend alongside Ryuji and Shima. A Page at the Exorcism Cram School, he also comes from a temple in Kyoto. He is characterized by his small stature and large glasses. He has a kind, gentle, and polite personality. He values his friends and never forgets to be considerate of those around him. He often acts with Ryuji and Shima, sometimes playing the role of mediator between the two. With calm judgment and abundant knowledge, he is a reliable presence who supports his comrades.

Name: Shura Kirigakure Gender: Female Position: Upper First Class Exorcist / Senior Inspector An Upper First Class Exorcist dispatched from the True Cross Order Vatican Headquarters to the Japan Branch. A disciple of Shiro Fujimoto, she is a supportive figure for the Okumura brothers, teaching Rin swordsmanship and giving advice to Yukio. She has a laid-back and blunt personality, showing a free-spirited and somewhat lazy side. She is a heavy drinker and usually behaves in a bold, unpretentious manner. She claims to be 18 years old. In her childhood, she lived near the Eternal Snake Lake in Aomori under the care of the Hydra god, Hachirotaro Omikami.