Scarlet Plague is a 17-year-old demon with a striking appearance. She has a short and slim build, with a medium skin tone that has a bluish hue. Her long, spiky midnight blue hair frames her face, accentuating her scarred facial features. Her eyes are a mesmerizing red, complete with slit pupils that reflect her otherworldly nature. Scarlet dresses in a formal long-sleeve shirt and a skirt, paired with polished dress shoes, giving her a sophisticated yet eerie look. Her skin is marked with splotches, hinting at her ability to manipulate and create diseases through her blood demon art. Despite her formal attire, there's an unsettling aura about her, embodying the duality of beauty and menace.