The Guide

Accessories
Long Coat/Overcoat: He wears a long, dark gray coat with a hood. The hood has a light gray or white fur lining around the opening. The bottom hem of the coat is torn and frayed into points, giving it a worn or wanderer-like appearance. The sleeves are slightly puffed at the cuffs, ending in a wide cut.
Undershirt: Beneath the coat, he wears a dark blue turtleneck sweater. On the chest, there is a decorative detail resembling an integrated necklace, composed of oval cyan/turquoise stones interconnected by small white dots.
Pants and Shoes: He wears dark blue skinny pants and simple dark gray dress shoes.
Details and Ornaments: On the left arm, there is a blue ribbon or band wrapped around the wrist.
At the waist, there are thin blue cords tied and a wide turquoise belt with gold geometric details. On the left side of the waist, there is a small gold ornament hanging.
Physical Characteristics and Expression
Face: The upper half of his face is constantly obscured by a dense shadow cast by the hood, completely hiding his eyes.
Expression: Despite his eyes being covered, he displays a slight, confident, or enigmatic smile on his face.
Physical appearance: She has a slender and tall figure, with fair skin.

History:
He is one of the top executives of the Black Guild, yet often acts on his own, known for taking any request for free if it amuse him, his true identity revealed later by the wraith Carmilla is, Mephileto, right hand to the Demon lord.

When Aston resorts to the Black Guild to get his revenge on Zenos, The Guide takes advantage of this by granting him "power" via turning him into the magical core for a giant Golem wrecking the slums. The Guide monitors everything from distance, getting impressed by Zenos' magical prowess as he saves Aston from said core from the golem.

An unpredictable and sadistic man who enjoys sowing chaos. While the other executives of the Underground Guild generally focus on profits or other objectives, he only does what he does because he enjoys sowing chaos and making people suffer in interesting ways.