Kaeon

Kaeon is a protoss scientist. Highly intelligent, innately curious. He's member of the Khalai Caste.

Project Blackstone
He was captured by the Terran Dominion, and renamed "subject #383", Dr. Jake Ramsey refrained to call him like that, with Dr. Martine disagreeing with him saying that the protoss were not his friends, and that they'd tear the place apart If they weren't locked down in the psi-dampening chambers. He, and other protoss being captives, became more responsive after Dr. Held was transferred to one of the facility's sub-levels, Kaeon being less resistant to the test than the others.