Shadow Heartless are common enemies in the Kingdom Hearts series. They are the most basic form of Heartless, characterized by their small, shadowy appearance and glowing yellow eyes. Despite their simplicity, they play a crucial role in the series as they are often the first type of Heartless encountered by players. Shadows serve as a representation of the darkness within people's hearts. These creatures are weak individually but can overwhelm players in large numbers, serving as a constant reminder of the ever-present threat of the Heartless.