Mermaid is a recurring demon character in the Shin Megami Tensei series, often depicted as a beautiful aquatic creature with the upper body of a woman and the tail of a fish. Drawing inspiration from European folklore, she is usually portrayed as both enchanting and potentially dangerous to humans. In the series, Mermaid typically appears as a recruitable demon or enemy, embodying water-based magic and charm abilities. Her role often involves themes of allure, mystery, and the supernatural.