Jonathan Faust

 was once the leader and founder of a raider gang called the Vipers. He was killed and was replaced by Asp.

Background
When Vault 15's overcrowded population spilled into the vast desert, Faust led a group in search of another place to live. While travelling, Faust was knocked into a hole filled with deadly Pit vipers. He was grazed by several fangs, but the poison was not enough to kill him. It was enough to make him hallucinate, though; he saw a vision of a giant viper, and knew that his destiny was binded to it. The Vipers were born.

During a minor conflict with the Brotherhood of Steel, one of the Vipers used a toxic arrow to kill one of the Maxson clan. This enraged the Brothers, and the remaining elders ordered for every last Viper to be scourged from the blasted earth beneath them. Faust was killed while defending the main Viper camp, and the few Viper survivors fled across the great mountains to the east.

Appearances
is only mentioned in the original Fallout.