CT-7567 (Heroes of the Empire)

CT-7567, nicknamed "Rex", was a clone Imperial Captain who previously served in the Grand Army of the Republic during the Clone Wars.

Rex was a honorable leader of the 501st Legion who cared about his company of soldiers and the repercussions of his actions. During the Great Jedi Purge, Rex changed in personality, becoming a worse commander who disregarded his soldiers, who at this time had mostly been replaced by recruits. There is a possibility that the Kaminoans, under the command of Darth Vader, tampered with his thoughts and feelings after the Clone Wars, turning him into a selfless commander of the Imperial Army.