Zuckuss

Zuckuss was a bounty hunter who primarily worked with fellow bounty hunter and assassin 4-LOM on missions. As a Gand, Zuckuss is vulnerable to oxygen which is toxic to him, and he suffered a severe lung injury whereby a woman that the duo had been hired to kill ripped off Zuckuss's face mask, exposing him to oxygen which burnt out his lungs.

After being summoned by Darth Vader to the Executor alongside fellow bounty hunters like IG-88 and Bossk, Zuckuss and 4-LOM developed a plan to infiltrate the Rebel Alliance by rescuing survivors from the destroyed Rebel Transports around Hoth, but they were informed by the surviviors that the Rebels possessed the technology to clone Zuckuss new lungs, and the two bounty hunters decided to officially join the organisation.

After teaching 4-LOM the art of meditation, Zuckuss proceeded to do so for many of the Rebel Alliance members, even long after 4-LOM had left to continue his bounty hunting career. Zuckuss would eventually see the end of the Galactic Empire and pick up his career as a bounty hunter himself, reuniting with 4-LOM and continuing the duo's rampage across the Galaxy.