Oliga Yakou is a mysterious and enigmatic character from the anime series 'Hyakki Yakou.' As a key figure within the series, Oliga plays a significant role in unraveling the secrets and mysteries that surround the supernatural events occurring in the story. With a calm and composed demeanor, Oliga possesses a deep understanding of the spiritual world and often acts as a guide for the main characters. Her presence adds an intriguing layer to the narrative, making her an essential part of the unfolding plot.