Ouzen the Immovable is a legendary White Whistle Delver in the anime and manga series Made in Abyss. Renowned for her immense strength and stoic demeanor, she oversees the Seeker Camp in the Abyss's second layer. As Riko's mentor and Lyza's former mentor, Ouzen plays a crucial role in revealing secrets about the Abyss and guiding the protagonists. Her enigmatic personality and immense experience make her a key figure in the series' exploration of the Abyss.