Nilz Yomm was a male Human doctor from Roon, father of Auren Yomm and husband of Bola Yomm. When Auren won the Roon Colonial Games, Governor Koong, the Governor of Roon, poisoned the province they lived in, Umboo with a chemical called rooze. Bola was poisoned but Koong accidentally poisoned himself. Nilz was called by Koong, but decided to heal Bola first. Unfortunately, he was unable to heal Koong in time, and Koong died.
- Treasure of the Hidden Planet
- Star Wars: Droids—"The Roon Games" (First appearance)
- Star Wars: Droids—"Across the Roon Sea"
- Star Wars: Droids—"The Frozen Citadel"
- A Guide to the Star Wars Universe, Second Edition, Revised and Expanded
- The Complete Star Wars Encyclopedia