Gregory Camelot is a world-renowned British magician and former mentor to Mamoru Hoshisato. He travels to Japan with his nephew and apprentice, Dina Camelot, responding to Mamoru's request to train Makoto Shiranui. Gregory consistently expresses disapproval of Mamoru's magical abilities, indicating a longstanding professional rivalry or dissatisfaction. His initial evaluation of Makoto proves equally critical, dismissing the young magician's skills during an early demonstration.

Gregory openly favors Dina over other potential apprentices, acknowledging his nephew's superior magical talent at the Hoshisato mansion. He reluctantly offers Makoto a chance to prove himself only after persistent appeals from Hatena and Yumemi, bolstered by Maeve Hoshisato's persuasion. This opportunity hinges on Makoto successfully performing his "best trick" to impress the skeptical master.

Subsequent interactions reveal nuanced professional dynamics. Gregory demonstrates meaningful engagement with Dina, Makoto, and Mamoru, suggesting a complex hierarchy of respect and mentorship beyond initial dismissiveness. His presence amplifies external pressures on the household, particularly when supporting directives from Mariah Grene and an unseen grandmother figure regarding artifact confiscation.