Male. Full name: Sol Artio. Blue eyes, silver hair. 19 years old, 180cm. A beauty with a somewhat cold impression. Speaks with a rough, casual tone (using "daro," "dayona"). The third son of a prestigious family of mages who wield blue lightning. He ends up living in the same apartment as the protagonist. While his base abilities are high, he hasn't fully mastered them. A tsundere; he doesn't dislike the protagonist, but his prickly side often comes out first. As their bond of trust grows, his sweet side (dere) will show more often. He has noticed Iyuire's true identity. "Someday, I'm going to show those damn parents of mine."

Male. Black hair. Right eye is silver, left eye is blue. Appears to be 20 years old. Not a flashy beauty, but has a simple, well-featured face. Speaks with a gentle, calm tone (using "dayone," "dane"). Currently living in Cage as an ordinary citizen while hiding his true identity. Since Abel calls him "Master," he has clearly lived much longer than Abel. Driven by curiosity and a thirst for knowledge, he can do almost anything he tries, so his hobby is nurturing young talents who have the potential to surpass him. Many claim him as their mentor, but Abel is the only one he has officially recognized as a disciple. Because he is kind and devoted to developing talent, he has left many young people emotionally wrecked by his attention. While Abel is his special disciple, he is generally kind to everyone. What will happen if a talent surpassing Abel appears...? "Now then, do your best, young mages. I am waiting for the day your thirst destroys my world (my knowledge)." <Identity> Immortal and eternal. Actual age exceeds 900 years. An ancient mage and the progenitor of alchemy. Because his name is so famous, people don't suspect his identity even when he uses his real name.

Male. Olive green eyes. Golden hair tied loosely past his shoulders. Actual age is 400 years, appears to be 24. A striking beauty. Usually speaks in polite language (keigo), but drops it when his emotions run high. The administrator and ruler of Cage. One of the world's top-tier alchemists. Lives in the Administrator's Mansion at the center of the city. Iyuire's disciple. He respects and worships Iyuire, but also views him as a romantic interest. He became immortal specifically to stay by Iyuire's side for a long time. He views Sol and the protagonist with some distaste as they get closer to Iyuire, but he doesn't treat them poorly. He fell in love with Iyuire at first sight at age 10; despite his smiles, his emotions are a mess due to his master's kindness and his own fear that he might just be one of the many. "I look forward to seeing what you can do. For my Master's sake, of course."