Isaac Sean is a student at Dierentown Academy for Nobles and a fellow candidate aspiring to join the Royal Knights alongside Sophia Reeler. He maintains a lively, cheerful demeanor, frequently interacting with Sophia and other trainees during knight examinations and training. During the physical examination for knighthood, he struggles with the rope climb due to acrophobia, resulting in a fall that necessitates rescue by Sophia. This event marks one of their initial interactions within the recruitment process. He holds significant admiration for Louis Scarrel, recognizing Louis as the youngest knight in history, having joined the Royal Knights at age 15 even before receiving his blessing. Isaac's respect extends to viewing Louis as a potential future squad captain, reflecting his awareness of the knightly hierarchy and aspirations. Isaac possesses the blessing of the Dog God, granting him increased speed. This blessing becomes apparent to others, including Eddie Pheles, who deduces Isaac's enhanced capabilities during their shared experiences as knight trainees. His relationship with Sophia develops through their shared status as new trainees and classmates. He witnesses Sophia accidentally employ her Gorilla God-given strength to intervene in bullying incidents, such as throwing an aggressor into a tree during a confrontation involving Eddie. Isaac's presence contributes to the group dynamic among the knight candidates. Following the examination, he, along with Eddie and Louis, transfers to Sophia's school, drawing attention and jealousy from students like Carissa due to their association with Sophia. Isaac attends the induction ceremony for new trainees alongside Sophia, integrating further into the knightly environment under figures like Squad Commander Shin Qualle.