Kal'tsit, often referred to simply as Doctor in Arknights, is a key character who plays a pivotal role in the series. As the Doctor, she is the strategic mastermind behind Rhodes Island's operations, bringing her vast knowledge and experience to bear in the fight against the Infected crisis. Kal'tsit is known for her calm and collected demeanor, often appearing distant due to her analytical nature. Despite this, she deeply cares about the well-being of her team, making tough decisions to ensure their success in a world filled with chaos and uncertainty.