Nightmare is a character from Arknights, a dark fantasy tactical mobile game. She is a quiet, fragile-looking girl associated with Rhodes Island, known for her eerie, dreamlike presence and psychological instability. Nightmare is connected to the arts and healing, with abilities that reflect both support and unsettling mental influence. In the story, she serves as a minor but memorable operator whose background hints at trauma and a split sense of identity, adding to the game’s themes of suffering, mutation, and hidden burdens.