Friedrich Keller was a Nazi officer and one of the key figures of the infamous Batarian August Uprising of 2345. Keller is known to be a very ruthless and merciless Nazi. He considers himself and the Third Reich as superior to all and like all Nazis, is very prejudiced. He also considers the mentally ill as inferior; calling them "Sub-Humans". He also has somewhat of a sick sense of humor which is seen when he taunts other soldiers in the multiverse.