Zaryos was a Human male, according to legends, residing at the Jedi Colony situated on the planet Ossus.
When the Sith Empire launched the Invasion of Ossus, the colony was preparing for departure. However, Zaryos communicated to Nadia Grell, Tau Idair, and the Alliance Commander that their departure was contingent on transferring their data to his astromech droid, specifically D9-S2. He stressed that they had discovered methods for cultivating crops within a radioactive environment, a piece of knowledge he believed would be incredibly valuable to the Republic. Idair reassured Zaryos that the situation was under control, and encouraged him to proceed to the shuttles to expedite the loading process for everyone. The Commander echoed this sentiment, leading Zaryos to concede and entrust the data to Idair, Nadia, and the Commander, just as Imperial soldiers made their appearance.