Kaine is a pivotal character in the action RPG NieR: Replicant. Known for her fierce combat skills and sharp tongue, she is a dual-wielding warrior who battles alongside the protagonist to defeat the monstrous Shades. Her complex personality is shaped by a tragic past, including being part-possessed by a Shade, which leads to her constant inner struggle. Despite her rough exterior, Kaine harbors deep compassion and loyalty towards her friends, making her an essential ally in the quest to save humanity and unravel the mysteries of their world.