Ko Zatec-Cha
Ko Zatec-Cha was both a practitioner of magic and the royal vizier on the world of Tammuz-an. Dissatisfied with his current position, he strived for absolute power over the planet, resorting to extreme measures to undermine the authority of the ruling sovereign, Prince Mon Julpa.
Biography

Ko Zatec-Cha initiated a plot to permanently remove Prince Mon Julpa several years prior to the Galactic Civil War. Employing his magic, he transformed the prince into a foolish amnesiac. Disguising him as a damaged droid, he banished him from Tammuz-an, forcing him to roam the galaxy as a simple-minded wanderer. Sollag Den, a devoted follower of Mon Julpa, absconded with the Tammuz-an royal scepter and fled his home planet, hoping to one day return it to the prince. This enraged Zatec-Cha, as he could not legitimately claim the throne without the scepter. Zatec-Cha contracted a bounty hunter named IG-88, tasking him with retrieving Mon Julpa and the scepter.
Later, Mon Julpa ended up at an auction in a mining settlement on Tyne's Horky. There, he encountered the miner Jann Tosh and the droids C-3PO and R2-D2. Together, they facilitated Mon Julpa's reunion with Sollag. Sollag utilized the royal scepter's magic to undo Zatec-Cha's enchantment, restoring the prince's mental faculties. Allying with a freighter pilot named Jessica Meade, they journeyed back to Tammuz-an to reclaim the throne.
IG-88 eventually located them in the royal city and seized the royal scepter. With it, he captured Mon Julpa and presented him to Zatec-Cha, who had already captured Jessica and Sollag. Zatec-Cha threw the prince into a dungeon pit, anticipating his consumption by a monstrous Durkii. All that remained was for him to assume the title of King of Tammuz-an.
To legitimately obtain the title, Zatec-Cha was required to present the royal scepter to the Keeper of the Tower and place it within a designated receptacle at the first sunrise of the equinox. However, Mon Julpa escaped the Durkii pit with the assistance of his companions and, following a pursuit, intercepted Zatec-Cha at the tower. After a short conflict involving Mon Julpa, Zatec-Cha, and their respective allies, the former seized the scepter from the latter and placed it inside the tower, securing his rightful position as king. Zatec-Cha was subsequently imprisoned for his treason, forever losing his aspirations of becoming king.
Personality and traits
Zatec-Cha was a male of the Tammuz-an species, characterized by purple skin, a lengthy black mustache, and a goatee. He also had two triangular marks situated beneath each eye. Zatec-Cha was consistently observed wearing the esteemed regal attire befitting his station.
Zatec-Cha received assistance from an inept Tammuz-anian sycophant named Vinga. Vinga's main purpose was to sing Zatec-Cha's praises and carry out every superficial task that Zatec-Cha delegated to him.
Behind the scenes
The voice of Ko Zatec-Cha in the Star Wars: Droids animated series was provided by John Stocker.