Uingali foar Marocsaa was a Paccosh male and a member of the Marocsaa subclan. He and a group of Paccosh met with Senior Captain Mitth'raw'nuruodo of the Chiss Ascendancy. He represented the Paccian Governance. Uingali owned a partial schematic of the Kilji picket cruiser Hammer.
Upon first meeting Thrawn upon a mining station, he entrusted Thrawn with a treasured ring of his clan depicting a chimaera, a symbol of the Marocsaa subclan. On their second meeting, Uingali commanded a starship bearing the chimaera symbol on its hull. Thrawn returned the chimaera ring to Uingali, but would eventually adopt the chimaera as his personal symbol.
Years after first meeting Uingali, Thrawn would become a Grand Admiral of the Galactic Empire. During that time, Thrawn's flagship Imperial Star Destroyer would bear the name Chimaera, as well as the image from Uingali's ring. Furthermore, many of the crew of the Chimaera wore a stylized symbol of a chimaera, either on their arms or pauldrons, to show their allegiance to Thrawn.
After the fall of the Galactic Empire, Morgan Elsbeth's assassin droids bore the stylized symbol of the Chimaera that the crew of the Chimaera once wore on the side of their heads.
At some point, refugees from the planet of Sunrise, led by the Magys, arrived at Rapacc. They were escaping from a brutal civil war caused by the Agbui, Haplif. When the Nikardun arrived in pursuit of these refugees, Uingali decided to conceal the refugees' existence from them. However, the Nikardun stayed and initiated a blockade and subjugation of the Paccosh. When the refugees insisted on traveling to the Chiss Ascendancy, where they hoped to receive help, Uingali permitted the population of two Paccian refugee vessels, which were able to evade the Nikardun blockade by escaping the Rapacc box system via either Shadow Number One or Shadow Number Two. The relationship between the Paccosh and the refugees would gradually deteriorate, however.
After the Nikardun chased a ship of unknown origin (the Chiss Vigilant) out of the Rapacc system. Uingali was sent, with a Paccosh taskforce, to an abandoned asteroid mining station to see if it had any sensors that would have picked up information about the ship. Before arriving, the Paccosh taskforce noticed that the external lights of the mining station had been turned on by someone inside. Preparing for a fight, Uingali sent a group of three Paccosh ahead to surround any intruders in the mining station's equipment bay. Upon arriving at the equipment bay, Uingali and the Paccosh met two beings of an unknown species. After establishing Taarja as a common language, one of the Paccosh acted as a spokesperson. They introduced themselves as Thrawn and Thalias, and Thrawn explained that they sought to preserve the art of cultures that were not able to preserve it on their own. Even though the Nikardun would wish the Chiss' capture if they were made aware of their presence, the Paccosh decided to let the Chiss go in peace after realizing that they could explain that the mining station's external lights were remote-activated. Before departing, Uingali gave Thrawn a double ring depicting a chimaera. He wished for Thrawn to keep it as a part of his art preservation project, hoping that the Marocsaa subclan would not be forgotten if the Nikardun exterminated the Paccosh people. Thrawn accepted the gift with honor, and Uingali inclined his head toward him. Uingali did not directly speak to Thrawn and Thalias, but he understood Taarja.
Later, Uingali would witness another ship of unknown origin (the Chiss Springhawk) battle and captured a Nikardun blockage frigate.
Upon the defeat of General Yiv at the Vak Combine homeworld of Primea, the Nikardun engaged in a power struggle amongst themselves. This resulted in most of the Nikardun withdrawing from Rapacc, allowing the Paccosh to revolt and defeat them. The Paccosh were able to capture their own Nikardun frigate in the process, and painted its underside with a depiction of a chimaera.
Several months later, the same unknown ship that had previously captured a Nikardun frigate returned to Rapacc. Senior Captain Thrawn, of the Chiss Ascendancy, introduced himself and his ship, the Springhawk. Apparently, Uingali did not recognize Thrawn's name from their encounter at the asteroid mining station. Uingali wanted to test the Chiss, as stories indicated that they were able to neutralize their enemies without destroying them. Uingali sent out a passenger shuttle and instructed the Chiss to disable it. When they did so without any damage, Uingali asked the Chiss what their purpose was, and Thrawn explained that they intended to ensure that the Nikardun blockading Rapacc had been defeated. He also intended to return the double ring that Uingali had given him on the asteroid mining station. Uingali, now recognizing Thrawn, invited the Chiss to the surface for a discussion. He specifically asked for Thalias to be in attendance. At the Paccian capital city of Boropacc, Uingali conversed with Thrawn, Thalias, and Chiss Mid Captain Ufsa'mak'ro (Samakro). Uingali asked Thrawn if the two refugee ships sent by the Paccosh ever made it to the Chiss Ascendancy, and Thrawn informed him of their fate. One of the refugee ships made it to the edge of the Ascendancy before being destroyed by the Nikardun, while the other ship's hyperdrive failed, causing its passengers to be asphyxiated. Uingali expressed sorrow that the Paccosh efforts were in vain, but Thalias encouraged him, stating that the arrival of the refugee ship in the Ascendancy was the spark that led to the defeat of the Nikardun. Uingali informed the Chiss of the refugees that were being harbored by the Paccosh, explaining that the Magys wanted to kill herself and her people instead of returning to their world. Uingali, knowing that the refugees were a matriarchal society, hoped that Thalias would be able to talk the Magys out of doing this. He also explained that the Paccosh were not on good terms with the refugees, but he also explained that the Magys was interested in the Chiss' desire to preserve the artwork for species not able to preserve it themselves. Thalias expressed doubts in her diplomatic abilities, but Thrawn believed that he would be able to establish a connection with the Magys using their fondness for art. The group subsequently left to speak with the Magys, who, alongside her people, was residing in a city a small distance away from Boropacc.
Upon arriving at the location where the Magys was residing, Thrawn was rejected by the Magys, who only wanted to speak with Thalias. During their conversation, Thalias was able to convince the Magys to join her and the Springhawk on a mission to investigate the status of her world before she could make a decision on suicide. Uingali informed the Chiss that the Magys had to wait for nine of her months with no contact from her world before she could make that decision, and, according to conversions, the Chiss only had two Chiss weeks before that time period expired. The Chiss informed Uingali about the mission to the Magys's world and departed shortly thereafter. Seven hours later, another Chiss ship, the Grayshrike, commanded by Senior Captain Xodlak'in'daro (Lakinda), contacted Rapacc and informed them of her desire to reach Senior Captain Thrawn. Uingali informed Lakinda of Thrawn's mission to the refugees' world and the current status of these refugees.
Uingali foar Marocsaa first appeared in the novel Thrawn Ascendancy: Chaos Rising in the Ascendancy Trilogy written by Timothy Zahn.