CT-1903

CT-1903, or Spectre, was a clone trooper of the Great Clone Forces during the Second Clone Wars. Spectre later survived the war and Order 50-1, eventually joining the Clone Rebel Alliance in the Third Clone Wars. He was responsible for jotting down the names of killed clone rebels in the battlefield.

Behind the scenes
Spectre was never really seen in the Second Clone Wars days. He only appeared in the times of the Third Clone Wars.