As a Human character, Tohri Challon demonstrated unwavering allegiance to Roan Fel and the Empire-in-exile he led. Initially, Challon's role was that of an Imperial Adjunct under Emperor Fel; she was the one who greeted Vikar Dorn upon his arrival aboard the Imperial Star Destroyer named Dauntless. As the Second Imperial Civil War unfolded, she earned a promotion to the rank of admiral. During Emperor Fel's meeting with the Jedi Order on Agamar, she commanded the Dauntless, and she ultimately died serving him, sacrificing herself to thwart a strike force's attempt to assassinate him.
In the year 137 ABY, Tohri Challon, holding the position of Imperial Adjunct, was stationed at the Imperial headquarters located on Bastion. This planet served as the center of authority for the dethroned Emperor Roan Fel and his Empire-in-exile. She extended a welcome to Vikar Dorn, who was the Governor of Munto Codru, when he supposedly defected with the entire crew of the Imperial Star Destroyer known as the Dauntless. However, this defection was actually a component of a Sith scheme planned by Darth Maladi, a Sith Lady, with the goal of having Emperor Fel assassinated by a Sith Lord named Darth Kruhl.
As the Second Imperial Civil War continued, Challon received a promotion to the rank of admiral and assumed command of the Dauntless, which now belonged to the Fel loyalist Navy. The Dauntless served as transport for Emperor Fel to the agricultural world of Agamar. This planet, situated at the edge of the territory controlled by Fel, was chosen for a meeting with representatives of the Jedi Order. Her second-in-command was Captain Basile.
Moff Nyna Calixte, who was the Director of Imperial Intelligence, traveled to Agamar and disrupted the meeting with the Jedi to deliver a warning to the Emperor. She informed him that the Sith had had sent a strike force with the intention of capturing him. Simultaneously, the Sith-aligned Star Destroyer War Hammer, under the command of Moff Rulf Yage, emerged from hyperspace and engaged the Dauntless. Challon gave the order for her entire crew to engage the Sith forces, in order to create enough time for Emperor Fel to be evacuated from the planet.
During the battle, the Dauntless sustained significant damage and lost its shields. Despite this, Admiral Challon instructed her crew to persist in attacking the enemy. This was done to provide cover for the Emperor's shuttle, enabling it to escape into hyperspace. As the shuttle carried the Emperor to safety, Challon expressed her respect for her monarch and conveyed her hope that he would remember her unwavering loyalty. Ultimately, the Dauntless was overwhelmed by the War Hammer and met its end through destruction. Challon and her entire crew perished in the explosion. Afterward, Fel quietly bid farewell to her and the soldiers he had lost, wishing them peace with the Force.
Challon was a steadfast supporter of her monarch, joining his resistance against the Sith Empire. She served him even if it meant sacrificing her own life. She remained composed while knowingly facing her death, and hoped to be remembered for her unwavering loyalty.
Challon's black hair was styled in cornrows, and she had a circular tattoo on her forehead, as well as tattooed lines on her cheeks. While stationed on Bastion, she wore robes and maintained well-manicured fingernails.