Rattataki/Legends

The Rattataki were a Near-Human species characterized by their chalk-white skin and bald heads. Virtually isolated from the rest of the galaxy, the Rattataki developed a violent society on their home planet of Rattatak, which involved extensive gladiatorial combat. Warrior Aidus and criminal Kaliyo Djannis were both Rattataki. Aurra Sing may also have been part Rattataki. The Nightsister and Dark Acolyte named Asajj Ventress was generally thought to be a Rattataki, while in fact she was a similar Zabrak-Human hybrid species called Dathomirian.

History
Rattataki were commonly thought to be descendants of a long-lost Republic expedition. Other inhabitants came mostly from Unknown Regions, but there were also the offwolder mercenaries who have come to Rattatak from time to time only to be stranded there. Due to harsh conditions, the planet's population was driven near to extinction. For eons, the Rattataki have been constantly battling themselves and their fellow inhabitants (represented by humans, Zabraks, Siniteens, Vollick and Weequay ) over the limited resources. Despite being nearly completely isolated from the outside galaxy, the Rattataki quickly created new ways to kill each other.

When the Sith returned to the galaxy a Sith Lord called Darth Vich noticed the Rattataki's natural ability in battle and took hundreds of tribes of Rattatki and made them his personal army. Among this army Vich found several force sensitives and turned them into his personal acoylets. Due to the Rattataki natural abilities in battle Vich's Army became a force to be reckoned with. However, Vich wanted more he tried to seize control of the Sith Empire. However his attempt failed and most of his Rattataki were killed or enslaved. A few of Vich's acoylets may have defected during battle and gotten full Sith training.

When many Rattataki warlords including the Siniteen criminal Hal'Sted had gathered an army in the southern hemisphere to challenge Osika Kirske, a powerful Vollick warlord had them killed so they could never be a threat to him. Only one child, who was looked after by Hal'Sted, named Asajj Ventress, escaped.

Rattataki had no major contact with the Republic until a Jedi Knight, Ky Narec, crash-landed. The Jedi soon found young Ventress, discovering her incredible potential to the Force. Together, they united armies and brought peace to the planet. But Kirske and some other warlords feared them and declared a truce to kill them. They only killed Narec, enraging Ventress. In her rage, she captured and/or killed the ones responsible for her master's death.

The Rattataki resembled the Dathomirian species to the extent that one infamous Dathomirian Dark Jedi by the name of Asajj Ventress was incorrectly but commonly referred to as a Rattataki.

Behind the scenes
Rattataki has been confirmed as a playable species for players who choose the Bounty hunter and Sith Inquisitor classes in Star Wars: The Old Republic. Asajj Ventress was formerly Rattataki preceding a retcon in The Clone Wars that altered her birthplace to Dathomir and her species Dathomirian.

Non-canon appearances

 * Star Wars: Battlefront II
 * Orders are orders
 * Sith make the best pancakes
 * Star Wars Battlefront: Renegade Squadron
 * Star Wars: The Force Unleashed video game duel mode
 * Path of the Jedi