Yarli Yren, a human individual, held the position of Republic Pathfinder during the era known as the High Republic Era, specifically in the year 382 BBY. They resided at Lady Jara's boarding house, situated in the town of Ferdan on the planet called Dalna, coinciding with the time when Jedi Knight Zallah Macri and her Padawan, Kevmo Zink, were also present. Macri was the first to arrive at the boarding house to secure lodging, and Jara informed her about Yren's presence, mentioning that they were an investigator. Subsequently, she communicated this information to Zink, advising him to proceed with caution until they could ascertain Yren's identity and the purpose of their presence on Dalna.
On the first night of Macri and Zink's stay at the boarding house, Yren was present during the evening meal. They did not acknowledge Zink, who also chose to ignore them. However, Yren engaged in conversation with Macri and provided her with a datacard containing a list of wanted individuals. The following morning, Yren was again in the dining room when Marda Ro, a member of the Path of the Open Hand cult that Macri and Zink were on Dalna to investigate, visited the boarding house to extend an invitation to the Jedi to visit the Path compound. Ro briefly glanced at Yren, but did not find them particularly remarkable. Later, Yren was summoned away from Dalna for an investigation, prior to the extensive flooding of Ferdan caused by intense rainfall. Following the flood, Zink encountered the wanted criminal Radicaz Dobbs at Ferdan's docking yard and recognized him from the list that Yren had provided.
Yarli Yren possessed brown skin and had a relatively short stature. Their appearance was unremarkable, contributing to their ability to blend in and be easily overlooked.
Yarli Yren made their debut in Path of Deceit, a young adult novel from 2022 penned by Tessa Gratton and Justina Ireland as a contribution to Phase II of the Star Wars: The High Republic multimedia project. In response to inquiries regarding the use of singular "they/them" pronouns for Yren in Path of Deceit, Gratton clarified that this pronoun usage was intentional, signifying that the character identifies as non-binary.