Apprenticed to Master Sol at the Jedi Temple on Coruscant, Jecki Lon was a Padawan with a deep appreciation for the rules and regulations that governed the galaxy. The studious Lon enjoyed Lightsaber form drills and helping to enforce the rules governing The High Republic. On her first mission to Carlac, Jecki helped to bring Sol’s former student, the fugitive Osha Aniseya, into custody alongside Jedi Knight Yord Fandar. On a mission to Olega, Jecki flew the Polan while attempting to arrest Osha’s sister, Mae, but the assassin was able to escape.

Jecki’s final mission was to the world of Khofar, where she and Osha were part of a team tasked with tracking down the Jedi Kelnacca and locating Mae. Following the tracker Bazil, Jecki bravely traversed the deep jungle and a hatching ground of umbramoths to locate Kelnacca’s shelter. The Jedi arrived too late. Encountering the Stranger, a fearsome dark side user in a twisted cortosis mask, Jecki and Sol mounted a courageous defense against the foe. When Jecki's saber was shorted out by the Stranger's cortosis gauntlet, she fought with Kelnaca's hilt until her own lightsaber reactivated, allowing her to gain a momentary advantage with the onslaught of two blades. Jecki was able to land a solid blow that broke the Stranger’s helmet, but, ultimately, she could not overcome his devious tactics.