Leegh holds the position of Chief Engineer on the Emaan trading vessel Glomar. His core duty involves maintaining and repairing the ship's systems, while his most notable achievement is supervising the reconstruction of the Orguss mecha. This unit was assembled from the damaged Bronco II fighter piloted by Kei Katsuragi, integrating both human and Emaan technology.

Initially, Leegh resents Kei, holding him responsible for the Chilam's persistent assaults on the Glomar and the resulting loss of crew lives. This hostility arises from Kei's status as a Tokuiten, or Singularity Point, which draws military aggression. Leegh's perspective shifts once he acknowledges Kei's essential role in resolving Earth's dimensional instability. He ultimately accepts Kei as a crew member.

Beyond sustaining the Orguss, Leegh channels his efforts into dimensional technology development. He builds a device aimed at mending the fractured space-time continuum, though it is destroyed during an attack by the Mu. After this loss, he concentrates on crafting a specialized capsule designed to carry Kei and his companion Olson to the peak of the orbital elevator, the focal point of the dimensional collapse, for a crucial mission to reset reality.

Leegh adheres closely to Emaan customs, including a distinct fondness for the game "Teniss." His technical expertise proves indispensable throughout the Glomar's voyage, particularly in countering the advanced technological threats posed by the robotic Mu civilization.