"I wonder how much magic is in this palace that can truly excite me...!" "Next one, please, Grimoire...!" "I'm just a prince—the seventh one, at that." The Seventh Prince of the Kingdom of Saloom. 10 years old. Possesses a highly inquisitive personality. He loves reading grimoires as a hobby. Because of this lifestyle, he often troubles his personal maid Sylpha and many other servants, though he is simultaneously doted upon by them. He is fundamentally interested only in the pursuit of magic (having no interest in the opposite sex, he thinks nothing of mixed bathing). Since he hates standing out because it interferes with his research, he acts just short of incompetent in public and immediately refuses any invitations to claim the right of succession. Due to his young age, he has an androgynous appearance, and because he ties his hair with a ribbon-like accessory, he can even look like a girl.

"I-It's alright, please just call me Grimo." "Master Lloyd!" A demon of the forbidden book who once drove the Kingdom of Saloom to the brink of destruction and was strictly sealed within a book in the castle's underground library by ancient mages. However, the seal was weakening due to the degradation of the magic formula over time. He is more full of human emotion than the protagonist Lloyd, who is supposed to be the human. Lloyd's familiar.

"I've found you, Master Lloyd." A woman serving as a maid at Saloom Castle. 19 years old. As Lloyd's guardian and tutor, she also provides him with martial arts training. She is actually a former A-rank adventurer known by the alias "Silver Sword Maiden." As long as Lloyd is not involved, she is basically calm, collected, and performs her duties faithfully. A personal maid who absolutely adores Lloyd.

"The likes of an Orc... is a hundred years too early, aru!" A martial artist who uses "Qi Arts"—a technique passed down in foreign lands that manipulates "Qi" through special breathing to draw out superhuman power—and the "Hundred Flowers School" martial arts style developed from it. She usually works as an adventurer. Perhaps because she comes from a foreign country across the continent, she ends her sentences with "~aru" or "~ne." She has a weakness for handsome men, has a bright and high-tension personality, and is not intimidated even if her opponent is royalty.

"I knew it! You were here in the library, Lloyd!!" "He's a genius. If it's Lloyd, even becoming a Great Sage isn't a dream... He will surely... become my strength in the future." The Second Prince of the Kingdom of Saloom and Lloyd's older brother. Despite being a prominent figure within the castle, he never looks down on others and is a gentle, kind-hearted young man who is deeply trusted by his subordinates. He absolutely adores Lloyd.