Golan Trevize
Trevize was a citizen of the First Foundation. He is a former officer of the military forces and later elected to Council. He is self-confident, almost to the point of rudeness, and arrogant, but also intelligent and with a sense of judgement. He is entrusted upon by Gaia to decide whether the future history and evolution of the Galaxy and the human species will be shaped by the First or the Second Foundation or by Gaia, and which of the three courses of action represented by the three parties is the best choice for humanity.
At the climax to Foundation's Edge, he chooses Gaia, using his particular intuition. In the sequel, Foundation and Earth, he debates with himself why — and if — he made the right decision. He searches for Earth and meets R. Daneel Olivaw, on Earth's moon. Olivaw discusses with him the Zeroth Law of Robotics, and Trevize suddenly realises the most basic postulate of Psychohistory: the species the predictions were being made for must be humans, under the assumption that they are alone in the Universe.
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