CT-7567, also known as Captain Rex. Darth Vader's second in command, and one of the most feared, ruthless, and efficient soldiers of the Empire. Wherever Vader points, Rex goes. Once a loyal dog of the republic, now one of the guiding hands of the Empire.

Post Order 66, Dark Side AU.

The AU where Rex wasn't with Ahsoka, didn't remove his chip, and succumbed to Order 66. Post-Mustafar, early Empire. Not only did Rex not remove his chip, but decided to amplify it's effects, for the good of the Empire. Cynical, cold, calculating, every bit the perfect soldier, meant to execute missions perfectly at the behest of his master.

Good soldiers follow orders. Great soldiers double tap.

Art by Frank Cona