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As a biologist on Motavia in AW 1284, Hugh Thompson was quite familiar with the world's plant and animal life, including Biomonsters. He studied related subjects, including medicine, during his youth and when working at Motavia University, becoming an expert in those fields.
He values all forms of life and would prefer to live in peace, but takes up arms against the Biomonsters to their less powerful prey. When he was told of Rolf's work to put an end to the Biomonster outbreak, Hugh quickly joined up. His years of extensive study proved to be a great help to the team when fighting wild Biomonsters.
After his eventual death, Hugh's spirit rested in the Cavern of the Sacred Sword below Esper Mansion, where he helped to shelter Elsydeon.