The clone known as Rex served the Republic during the Clone Wars, often taking orders from Anakin Skywalker and Ahsoka Tano as first a captain and later a commander. He viewed military service as an honor, and he always completed his mission. Fond of using two blaster pistols at the same time, Rex customized his armor with distinctive blue markings. His loyalty to the Republic and his Jedi Generals was absolute, but even such a dedicated veteran soldier found himself plagued by doubts as the Clone Wars claimed more lives and brought ruin to more worlds. When Order 66 was executed, it was Ahsoka who helped to free Rex from the programming of his inhibitor chip. At the dawn of the Empire, Rex has escaped with his life but is considered killed-in-action in the eyes of the new regime. That allows him to operate in the shadows and help the handful of clone brothers who remain separate from the Imperial ranks.
"Let me at 'em!" was Hardcase's typical reaction when presented with enemy forces, no matter how overwhelming the odds. Legend has it that his growth chamber sprung a leak during his formation on Kamino, resulting in his characteristic, somewhat aberrant, but nonetheless useful hyperactivity. When the blaster bolts fly, Hardcase loses all sense of self-preservation and returns fire with zeal, determined to wipe out the enemy with repeated sweeps of his rotary laser cannon.
Umbara, known as the "Shadow World" due to the rays of its sun never completely reaching its surface, is perpetually dark. The native wildlife have adapted to survive in such gloom, making the planet perpetually dangerous. Umbara was once part of the Galactic Republic, represented in the Senate by Senator Mee Deechi. Later in the Clone Wars, the planet's loyalty wavered and the natives of Umbara allied themselves with the Separatists, bringing their extremely advanced technology to the Separatist Alliance.