Viviana Droste is a character from the game and anime series Arknights. She is a high-ranking member of the Kazdelian military and serves as one of the antagonists during the events of the game. Viviana is known for her composed demeanor, strong combat abilities, and unwavering loyalty to her country. She often acts as a strategic commander, orchestrating operations with precision. Her presence brings significant challenges to the protagonists, making her a formidable and memorable adversary in the series.