This article contains plot details from the latest book.
Timur is one of Linh's dwarven bodyguards. Timur was first mentioned in Book 8.5: Unlocked, in Linh Hai Song's Registry File in a section named Bodyguards. It said that Linh has two bodyguards, one of which is Timur and the other of which is Urre. Timur remains primarily underground and has not shared anything about himself with Linh.
The name Timur means "Iron" in Turkish.