Derkila is an extremely tall demon, taller than Sullivan, with fair skin, waist-length purple hair with a small section tied into a round bun, and several strands covering the upper part of her face. It has pointed ears, dark claws, and white horns that curve sharply upwards. Derkila is shown to have a laid-back personality who loves keeping himself entertained. Fairly mischievous but still smart and responsible. He seemed to bear great adoration for the Demon World.