Klaus Bachtein is a human scientist encountered on Alternate Earth. He is a minor character in Star Ocean: The Last Hope.

A genius physicist who lives in the abandoned town near the military facility. Formerly engaged in space development research with the military (where he secretly worked on extraterrestrial technology), he decided to abandon his work there as it conflicted with humanitarian ideals and his own beliefs. He was placed under house arrest by the military soon afterward. Despite his mild-mannered nature, he is very hard on himself, believing in the credo that you cannot advance down your life's path until you figure out what that path is for yourself. Records indicate that the man responsible for developing the warp drive, Professor Trillas Bachtein, may have had an ancestor named Klaus as well.

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