Aigis is an anti-Shadow weapon and one of the main protagonists in the Persona series, prominently featured in Persona 3 and making appearances in Persona 4. She is a humanoid robot designed to combat Shadows, beings that prey on the minds of humans. Aigis is known for her stoic yet curious nature, as she learns about human emotions and experiences. In Persona 4, she makes a cameo appearance, offering support and insights to the main cast, contributing to the overarching narrative of self-discovery and facing one's true self.