KOS-MOS is a fictional character from the video game series Xenosaga, developed by Monolith Soft. She is an advanced android designed for combat and is known for her exceptional abilities in battle. KOS-MOS serves as a protector of humanity and plays a central role in the game's narrative, exploring themes of existence and consciousness. In the Xenosaga series, KOS-MOS is equipped with various weapons and combat techniques, making her a formidable ally. Her design combines elements of science fiction and anime, contributing to her popularity among fans. The character's journey intertwines with the game's complex story, which delves into philosophical questions about technology and humanity.