Chief Guld is the test pilot of the YF-21 Design Team; an aircraft cotrolled by the mind. Guld is half human and half Zentraedi. The Zentraedi are a warrior race and have exceptional natural combat qualities which makes Guld ideal for the YF-21. Guld however, supresses these emotions as inside lies an intorelable, impossible evil.
"It was me all along. Why didn't you tell me?"
Guld's relationship with Isamu is more than one of rivalry. He reacts with hostility once he learns that Isamu is the new test pilot for the YF-19. He calls him a man with no self-control, and a danger to the Super Nova Project.
"I hope you haven't unpacked; it'll be better for all of us if you leave now"
However when Guld discovers that Myung has also returned to Eden, his dillusions intensify. Guld's suppressed emotions surface at a live fire excercise of the YF-21, and nearly costs Isamu his life.
"Just what the Hell were you thinking?!!"
"You have the Devil's luck. I don't know how you survived."