Ouzen

オーゼン

Ouzen, "The Immovable Lord," holds the elite White Whistle rank and resides at the observation base, known as the Seeker Camp, on the second level of the Abyss. She leads a small group of cave raiders called "The Layabouts." Ouzen served as a mentor and was a close friend of Lyza, Riko's mother.
Ouzen is an unmatched fighter; her unique relic, "Thousand Pins," provides her with superhuman strength, speed, and longevity. Although Ouzen appears young, she achieved the rank of White Whistle more than 50 years ago. She stands over two meters tall and sports a distinctive hairstyle that hides scalp deformations resulting from prolonged exposure to the Curse of the Abyss.
Ouzen exercises absolute control over her facial expressions, making it impossible to determine her true feelings (or lack thereof) with any certainty. The motives behind her actions remain unknown as well—Ouzen seldom bothers to explain herself, and even when she does, it is impossible to tell whether she is being truthful or merely toying with her audience.