Rook is a Prototype Imperial Dark Trooper in Star Wars: A Clone Apart. He has no emotions and would express certain human feelings out in words. He usually likes killing alien species on different planets like Geonosis and Tatooine, although he needs permission to kill military targets. He killed a jawa and stoled the jawas rifle at Tatooine. Like other Imperials, Rook likes and wants Danson's rifle. He can be hurt by his other teammates' mines and detpacks because he is only a prototype and was not fitted with code sensors. He was responsible for hurtling McBomb, Alpha-12, Bhiff Gamma-09, and Percy further into the future with Danson. He can translate languages, although only seen understanding Jabba's language: Huttese.
Since he is a droid, he expresses human feelings in words like 'Audible Sigh', 'Downcast Expression', 'Playfully Murderous', 'Merciless Laugh', 'Girlish Scream', 'Frustrated Grumble' as well as 'Resigned Frown'...