- "Being a butler is surprisingly more fun than I thought. I get to walk around all day in a nifty suit and serve the beautiful Queen and spend time with lovely maidens. The pay isn't even that bad. Only problem is that demon knight...Such an intimidating fellow."
- — Solus reminiscing on his job
Solus Fang (ソラス ファング, Sorasu Fangu), often nicknamed Solo (ソロ, Soro) by friends or Mr. Fang by Hisui E. Fiore, is a butler working at the Mercurius Castle, an elf originally living in a village far away from humans, he was cursed by a human to have the effects of Charm Magic projecting through his face, making any woman fall for him through simply a glance at his face, resulting in him abandoning his village and avoiding making contact with others.
He was eventually given a solution to his curse, a mask that prevents the magic's effect by hiding his face entirely, and after various events, ended up becoming a butler within the Mercurius Castle. Due to his distinct appearance, he is commonly addressed as the Masked Butler (仮面執事, Kamen Shitsuji).