Lakooni, whose core name was Xodlak'oo'nifis, was a Chiss female serving as the Patriel for the planet Celwis, a key location for the Xodlak family. Within the Xodlak family, Lakooni possessed the blood rank.
During the Agbui's scheme to instigate a civil conflict within the Chiss Ascendancy, Patriel Lakooni received contact from Celwis Xodlak Councilor Xodlak'uvi'vil (Lakuviv). Their meeting occurred at Redhill Hall, where he divulged the existence of an unclaimed nyix mine situated on the planet Hoxim. Lakuviv conveyed that control of this mine would restore honor and prominence to the Xodlak family, potentially elevating them to the status of a Ruling Family. Lakuviv proposed seizing Hoxim by utilizing Xodlak warships. Lakooni, however, suspected an Agbui trap and forbade any such action. Subsequently, Lakuviv claimed the Cuduyo family Patriarch was contemplating using the Xodlak warships on Celwis for a family emergency related to the nyix mine. Enraged, Lakooni demanded to use Lakuviv's comm to secure the Xodlak ships. Unbeknownst to her, Lakuviv was tapping the call, recording the authorization codes used at the beginning and end of her orders. Lakuviv then revealed that he used these codes to initiate a Xodlak family emergency, summoning all active-duty Xodlak officers to man the warships for the capture of Hoxim. When Lakooni threatened to countermand his summons, Lakuviv drew a charric and took her as a hostage. Simultaneously, the Agbui, who had manipulated Lakuviv, also influenced the Pommrio and Erighal families to initiate their own family emergencies to seize Hoxim, anticipating that the competing claims would ignite a civil war within the Ascendancy. Yet, this plan was thwarted due to the efforts of Chiss Senior Captains Mitth'raw'nuruodo (Thrawn) and Xodlak'in'daro (Lakinda), along with Mid Captain Csap'ro'strob (Apros). Consequently, Lakuviv and his senior aide, Xodlak'ji'iprip (Lakjiip), were imprisoned for their actions.
Following the failure of Lakuviv's scheme to acquire the nyix mines, which proved to be an Agbui deception, Lakooni escaped captivity and imposed disciplinary measures upon Lakuviv and Lakjiip. Specifically, she removed Lakuviv from his position as Xodlak Councilor. She also interrogated yubal rancher Xodlak'phr'ooa (Lakphro), whose ranch had been selected to harbor the Agbui's ship and personnel during their stay on Celwis. During the interrogation, Lakphro maintained that he had already disclosed all his knowledge of the Agbui to her and her interrogators. The rancher also inquired about the fate of the Coduyo midager, Coduyo'po'nekri (Yoponek), and the Pathfinder, Qilori. Lakooni responded that the Pathfinder had escaped with the Agbui and that the midager would be interviewed soon.