4-KT began its existence as a medical droid. It holds the distinction of being among the initial droids dispatched by Riboga, the Hutt, through QS-2D to establish mining endeavors on Uffel. Given the lack of demand for medical expertise on Uffel, 4-KT underwent a reprogramming process, transitioning into droid development and collaborating with G-8Y5. The droid found fulfillment in this creative pursuit, often extending its work periods until its power cells were completely depleted.
Physically, 4-KT's appearance was akin to a silver humanoid skeleton, accentuated by vibrant yellow eyes. A unique feature was its head, which possessed a slightly elongated shape due to an additional box-like structure affixed to its back. Each hand was equipped with ten elongated fingers, granting it exceptional precision. When not actively utilizing these extra fingers, 4-KT generally kept them extended.