NegaDuck was hatched to an unknown Duck family on the species homeworld, the Duck'o Prime. He had quickly become a thief, and as the years progressed, he gradually became infamous as one of the planet's worst robbers, murderers and terrorists. His infamy allowed him to be noticed by the Duck Sith Lord, Darth Daffy, who wanted to gather as many criminals as he can to create his Daffia's soldatos army. The crime lord sensed his latent Dark Sidepotential and promptly made him a Caporegime.
NegaDuck served well his Master and his crime syndicate over the course of following years. He supervised planet destruction and doubled as a pimp, to improve the organization's benefits. He often cooperated with Daffy's official Sith Apprentice, Darth Ducky, sewing the seeds of death on many ravaged worlds. Occasionally, the Duck Sith Lord trained him in the use of the Dark Side, to enhance his already astounding efficiency. However, after a couple of years, the fearsome Sesame Street decided to monopolize the planet-destruction market and engaged the Daffia in a destructive conflict. A war broke out.
The ensuing conflict was fierce and bloody. It quackly quickly became a war between the entire Duck and Puppet species, the eternal arch-enemies. The loses were high on both sides, and a dozen of planets was destroyed. Both Darth Ducky and NegaDuck were much more active than their boss (busy with the Duck Star Project), massacring numerous Puppets single-handedly. NegaDuck was also the only one Duck that Sesame Street's members had some respect for.
NegaDuck was not present on the planet when the destruction occurred. As such, he became the sole survivor of the Duck species. It was rumored, that he hid in the dark corners of the known galaxy, seeking for the tremendous Duck Star. It was located in a remote system, which coordinates were classified. The insane Duck wanted to avenge his PWNed Master, but unfortunately Elmo was faster.
NegaDuck, similarly to his colleague, Darth Ducky, was vicious, cruel, evil, psychotic, violent, mentally unstable, fanatical, impulsive and insane. He tended to laugh maniacally when PWNing his enemies and he had a frightful habit of revving his saw of doom before attacking.
NegaDuck possessed moderate Force-sensitivity. However, his terrible temper and use of the Dark Side amplified his power and allowed him to use the Force with destructive efficiency. He was also very proficient with his saw of doom. It was made from a cortosis alloy, thus he was capable of engaging lightsaber-wielding opponents.
That was he who invented the Force quack technique, sonic-based Duck-exclusive Force offensive power.