In the original series, he was voiced by Banjō Ginga and the late Kōji Totani in episodes 12 and 16-17 respectively.
Cozun was a Zeon soldier serving under Ramba Ral. He participated in the attack spearheaded by Ral on White Base, serving as one of his wingmen in a Zaku II as Ral piloted the Gouf against the Gundam. During the attack, Cozun was cornered while falling back and taken prisoner aboard White Base.
However, Cozun manages to escape from his confinement by using an explosive tooth to bust out. He then infiltrates White Base and remotely sends top secret info on it to Ramba Ral. Later though, as he is trying to escape, he is killed when Omar Fang fires a bazooka on the door between them, knocking Cozun back and causing him to plummet to his death.
Principality of Zeon