Uldarlas Irayassu was a Great Knight who participated on the Eclipse Expedition under the command of Parean. She was good friends with Delphius and Lobaten, all of whom were of a similar age. Among her friends, Uldarlas had a reputation for asking many questions, most of which her captain, Parean, was able to answer easily, and looking for controversial issues to gossip about. However, with this inquisitive attitude came her ability to also perceive and analyse information presented to her and Parean noted her for her detective capabilities when she was not trying to be overly imaginative. Her persistent questions would often irritate Lobaten, who usually told her to pay attention more to Parean's answers so as not to repeat them.