Cresto was a blue male Pathfinder. He was part of the crew of the Pathfinder vessel working alongside Neeyala, Kreetago, and Shreena on wormhole research.
He refused translator microbes even though Zhaan tried to explain that she needed to be able to talk to him in order to treat him. He died before the crew of Moya could help him. ("Self-Inflicted Wounds - Could'a, Would'a, Should'a")