Lylos Tannon was a Twi'lek female who served as a police officer within the Coruscant Security Force on the planet of Coruscant throughout the Galactic War era.
Tannon, in her role as a police officer for the Coruscant Security Force, investigated a cybernetics scheme orchestrated by Doctor Zeke and his associate, Bolgm. Despite observing their actions over several weeks, she couldn't catch them committing the crime. Shortly after the defeat of Revan, Tannon sought assistance from Agents Theron Shan and Jonas Balkar from the Republic Strategic Information Service to apprehend the criminals. During a planned operation in the Dealer's Den, Tannon accused Shan of cheating at Sabacc, which attracted Bolgm's attention due to Shan's cybernetic enhancements. Although Shan was initially unaware of Tannon's true identity, he played along with the deception until Doctor Zeke revealed himself. Tannon then diverted Bolgm's attention while Shan attacked him, forcing him to the ground, after which Tannon rendered the criminal unconscious using the handle of her blaster. Simultaneously, Shan pursued Doctor Zeke, joined by Balkar. Shan tackled the doctor, and Tannon successfully handcuffed him. Tannon expressed her gratitude to the agents for their assistance, and before departing the Dealer's Den, the trio celebrated with a toast to Tannon's anticipated promotion.