Sylvia was a chimera and one of the eight generals of the Demon King, serving as the director of the Monster Enhancement Division. She served as the primary antagonist of the Konosuba Movie. Sylvia had free-flowing bangs that were highlighted red and long, straight hair partially kept up in a bun at the top. Her eyes were purple and she had pointed ears similar to an elf, leading Kazuma to believe she might be some kind of demon. At first glance, Sylvia appeared as a towering, voluptuous and beautiful woman. She was so attractive that Kazuma seriously considered defecting to the Demon King's Army to be with her. As a chimera, Sylvia possessed traits typically unique to both males and females, having big breasts and the figure of a woman, but also male genitalia. Sylvia wore a crimson leather one-piece dress with low cut made from the skin of low-level devils, white-sleeved gloves, brown stockings, dark-red shoes, a gold necklace and a single blue earring on her right ear. She usually carried a rope around with her to use for the "Bind" skill. After absorbing the mage killer, the lower part of Sylvia's body took on the shape of a metallic centipede with gem inscriptions. In the movie, after reviving and merging with Beldia and Hans, her lower body acquired a metallic semi-arachnid form around a blue semi liquid core and limbs. Sylvia's red dress is replaced with orange spikes that cover her breasts. Sylvia was a smart and charismatic leader who seemed to genuinely care about the well-being of her subordinates, often shielding them from the magic of the Crimson Magic. She was shown to be very observant, such as when she deduced that Kazuma wasn't the famed magic swordsman Mitsurugi by noticing the low quality of his blade. She was quite the seductive type as well, mainly due to the fact that she wanted to seduce Kazuma when he was taken hostage. Sylvia also likes to taunt her enemies and make rude remarks about their strategies and their predicaments. When she's angry, her voice all of a sudden deepens and sounds more masculine.