A silver-haired commoner mercenary and ruthless magic tutor who utilizes unorthodox, harsh training methods. He rises to become the most sought-after instructor among noble houses while pursuing his own magical breakthrough.

The arrogant and insecure second daughter of House Duplain who undergoes a harsh reformation under Derrick's tutelage. She develops a strong attachment to Derrick, striving to prove her worth in high society through magic.

The patriarch of House Duplain who initiates the main plot by hiring Derrick to reform his unruly daughter. He seeks to stabilize his house's reputation but remains blind to the dark forces brewing within his family.

Diella's hostile older brother who initially seeks to discredit her through a magical duel. He eventually succumbs to mysterious dark influences, murdering his family in a tragic descent into madness.

An ambitious noble mage struggling with an inferiority complex who hires Derrick to prepare her for a duel against her rival. Through rigorous training, she conquers her fears and displays incredible growth in combat.

The talented rival of Ellente Belmiard whose magical prowess serves as a major benchmark for growth. She represents the rigid standards of high nobility that the disciples must overcome.

A young noblewoman from the Veltus Grand Duchy who reluctantly trains under Derrick to improve her magical standing. Despite her initial laziness, she grows into a highly skilled wind-magic user.