About StarCraft - A real-time strategy game developed and published by Blizzard Entertainment for Microsoft Windows.Set in a fictitious future timeline during the 25th century AD in a distant part of the Milky way galaxy known as the Koprulu Sector, the game revolves around three intelligent species fighting for dominance: the Terrans are humans exiled from Earth who are now skilled at adapting to any situation; the Zerg are a race of insectoid aliens in pursuit of genetic perfection and obsessed with assimilating other races; the Protoss are a humanoid species with advanced technology and psionic abilities who are attempting to preserve their civilization and strict philosophy about their way of life from the Zerg.

Following are the Concepts of Terrans. 

Taking inspirations from the amphibians and their Characteristics.

Thank you. :)