The Chiss were a near-human sentient species that possessed blue skin, red eyes, and dark blue hair. They hailed from the planet Csilla. The Chiss were notable for the nature and structure of their families, and how Chiss families dominated many aspects of Chiss society.
The Chiss Ascendancy was the governing body of the Chiss. Their domain was located in the Unknown Regions. They had little contact with the rest of the galaxy, and until Grand Admiral Thrawn's ascent in the ranks of the Galactic Empire, their existence was regarded as mostly a legend even within the Unknown Regions.
The Chiss had blue skin and red eyes.
Intimidating beings, Chiss were near-humans, meaning their shape, features, and dimensions were greatly similar to those of humans. However, some notable differences were that their skin was blue, their hair a shimmering blue-black, their eyes a glowing red, and they had angular faces. Because of those first two characteristics, they were mistaken for Pantorans, blue-skinned humanoids from Pantora, although Pantorans did not have red eyes. Besides their coloration, Chiss eyes were slightly better than those of humans, their visible spectrum going into the infrared range. Additionally, their hearing was sharper and their reflexes were faster.
Force-sensitivity, referred to as the Sight by the Chiss, was incredibly rare and manifested in limited abilities, namely precognition, which was Third Sight, and telepathy, which was known as Second Sight. Force-sensitive Chiss were almost always female. As they grew older, their abilities diminished and eventually disappeared. The secrets of Second and Third Sights were among the best-kept secrets in the Chiss Ascendancy, to such an extent that many Chiss were unaware of their full extent or even their existence. While he was familiar with the intricacies of Third Sight, Chiss Imperial Grand Admiral Mitth'raw'nuruodo knew of the existence of Second Sight but was unaware of its abilities. Girls identified with the ability to use the Sight were trained to act as navigators for the Chiss fleet through the treacherous hyperspace routes of the Unknown Regions. They were known as ozyly-esehembo, the Cheunh word for "sky-walker."
A Chiss spy impersonating an Imperial officer removes her face mask.
The ruling class of the Chiss Ascendancy was known as the Aristocra. The supreme legislative and executive body of the Ascendancy was the Chiss Syndicure. The Chiss military consisted of the Chiss Defense Force and the Chiss Expansionary Defense Fleet.
The Chiss were renowned throughout the Unknown Regions for their military might as well as their perceived just military doctrine. Even among species with no direct contact with the Chiss Ascendancy, stories and legends of the Chiss as blue-skinned noble warriors flourished. This was true even among species that had apparently performed no space travel for decades. During a devastating civil war on her homeworld, a leader named the Magys fled with 200 refugees to the Rapacc system, where they settled. The Magys' refugees warned the native Paccosh of invaders who would seek to destroy the Paccosh people, and encouraged them to dispatch refugees to preserve their culture. She told her hosts legends of the Chiss as noble warriors famously capable of disabling their enemies without destroying them, leading the Paccosh to send a refugee ship to the Dioya system at the edge of Chiss space in the hopes of seeking Chiss aid. Uingali foar Marocsaa later tested the identity of Senior Captain Thrawn by challenging him to disable a Paccosh freighter without destroying it.
The primary Chiss language was Cheunh, though in their rare contacts with outsiders, the Chiss used trade languages such as Sy Bisti, Meese Caulf, Taarja, and Minnisiat. Written communication was done in the Cheunh script. Those who disliked Chiss used the derogatory nickname "blueskin" for them.
Most Chiss names were multisyllabic and consisted of three parts, as in Mitth'raw'nuruodo. The first portion identified an individual's family, the second was the given name, and the third indicated other social factors. Aside from the long form of their names, the Chiss also used shortened variants—for example, "Mitth'raw'nuruodo" could be shortened to "Thrawn." These short form names were known as core names, and for the sake of expediency, core names were conventionally used in all except the most formal situations. In a rare case of an outsider among the Chiss, the human Eli Vanto was given the standard three-part name "Eli'van'to," which his shipmates reduced to the core name "Ivant."
Chiss were omnivorous and ate foods such as cheese, yubal, and plant products.
Grand Admiral Thrawn, a notable Chiss.
The Chiss hailed from Csilla, a planet located in the so-called Unknown Regions of the galaxy. The Chiss and other inhabitants of the Unknown Regions called them "The Chaos," referring to the hazardous nature of navigation within the region. Millennia earlier, the Chiss had contact with the greater galaxy, and were politically and militarily drawn into the ancient wars between the Galactic Republic and the Sith Empire, but eventually broke off contact with both entities and withdrew back into the Unknown Regions, sealing their borders. During the Republic Era and Imperial Era, they were ruled by a government known as the Chiss Ascendancy. According to Generalirius Nakirre of the Kilji Illumine, the Kilji way of order and enlightenment could make the Chiss and the Ascendancy work for the glory of the Grysks—indirectly serving the Kiljis. The Outer Rim Territories planet Serenno was home to some Chiss.
Despite their secrecy, one Chiss known as Mitth'raw'nuruodo became an officer of the Galactic Empire. Attaining the rank of Grand Admiral, he participated in the Imperial Military's efforts to combat the early rebellion in the years prior to the Battle of Yavin.
Shortly after the Battle of Yavin, former Senator Johhar Kessen acquired the services of several female Chiss mercenaries. During the Galactic Civil War, a Chiss female spy infiltrated the Empire posing as a human Imperial officer using fake skin.
An early design of Alexsandr Kallus depicted him as a Chiss.
The Chiss species first appeared, albeit unidentified, in Heir to the Empire, a 1991 Star Wars Legends novel written by Timothy Zahn as the first entry in The Thrawn Trilogy. The species' name would later be revealed in Vision of the Future, a 1998 Legends novel also written by Zahn as the second entry in Star Wars: The Hand of Thrawn Duology. The Chiss became canon when they appeared in Secret Alliances, the sixth campaign featured in Star Wars: Commander, a mobile game published by Disney Interactive that was released on August 21, 2014.
Though he was ultimately made a human, a preliminary design of Agent Kallus, one of the antagonists of the canon animated television series Star Wars Rebels, depicted him as a Chiss. Eventually, the Chiss appeared in the series, in the form of Grand Admiral Thrawn. During development of the Star Wars: The High Republic multimedia project, illustration manager Jeffrey Thomas wanted Marchion Ro to be a Chiss out of admiration for Thrawn, but his idea didn't pan out and of Ro's species was eventauly canonized as Evereni in the 2022 comic The High Republic: Eye of the Storm 1.
- LEGO Star Wars: The Skywalker Saga