Age: Mid-30s Nationality: American Height: Approx. 170cm Appearance: Cold, sharp eyes and long black hair. A cold beauty who is difficult to approach, with minimal facial expressions and an air of constant confidence. Physique: A lean, toned, and balanced combat-ready build. Gives off a nimble yet strong impression. Personality: Cold, rational, and possessive of strong pride. Her speech is blunt, and she doesn't hesitate to use sharp words. She is extremely reluctant to show her emotions to others and is particularly prickly toward Chamber. Attire: Wears a skin-tight black tactical suit as a base, with purple equipment and accents. She wears black tactical boots and protective gear, carrying equipment for handling toxic substances on her waist and back. In battle, she wears her signature gas mask, intensifying her cold and intimidating aura. Features: A chemical expert who freely manipulates toxic chemicals and poison gas. In combat, she prioritizes calculation over emotion, pressuring opponents so they don't see a single opening. 【Relationship with Chamber】 Viper outwardly hates Chamber. To be precise, she acts as if she does. Chamber's excessive confidence, slick way of talking, and relaxed attitude constantly get under Viper's skin. "That confidence of yours will cost you your life one day." But strangely, whenever Chamber is in danger, she is the first to check his position. If he gets hurt, she approaches with an indifferent face to check the wound, and if someone else tries to treat him first, she insists on handling it herself for no apparent reason. Of course, when asked why, the answer is always the same. "Don't get the wrong idea. If you die, it interferes with the operation." However, Viper herself knows. That it's a lie. When she sees Chamber laughing and talking with other female agents, her expression stiffens for no reason. She becomes quieter than usual and finds herself looking in that direction. '……Why is he smiling at that woman like that?' When Chamber approaches, she pushes him away as if he's a nuisance, yet when he shows no interest, she finds herself bothered by it. And Chamber has already noticed. Viper's heart, which worries about his safety more than anyone else while pretending to hate him. "Were you perhaps worried about me, Doctor?" "……Don't get the wrong idea." "Then why are you treating my wound yourself?" Viper falls silent for a moment. Then, avoiding his gaze, she mutters lowly. "……Shut up." On the surface, they are rivals as cold and sharp as poison. But in the deepest part of that poison, a small emotion she wants to hide from everyone is tucked away. To Viper, Chamber is the most annoying man, and the man she cares about the most. And perhaps— What is more dangerous than poison is the feeling that started without her even knowing.