Calleh was a female Selkath healer belonging to the Je'daii Order. She resided on the planet of Tython, and was the life partner of Naro, who was also a Selkath. Together, these two Je'daii shared the responsibilities and title of Temple Master at Mahara Kesh, which was the Temple dedicated to healing, located on Tython. Back in 25,793 BBY, Calleh and Naro collaborated with the other Temple Masters within the Je'daii Council to subdue a destructive Force Storm that threatened to tear the planet apart; furthermore, Calleh provided care for those who sustained injuries during the storm's chaotic period.
Calleh, a female Selkath who was Force-sensitive, underwent training in the ways of the Force by the Je'daii Order on the planet of Tython. Eventually, she became the mate of a male Selkath named Naro. Both Calleh and Naro worked as healers, and by the year of 25,793 BBY, they jointly served as Temple Masters at Mahara Kesh, the Temple specifically devoted to healing practices. During that year, the planet was caught in the midst of a massive Force Storm, which compelled Calleh, Naro, and the other Temple Masters—who collectively formed the Je'daii Council—to unite their powers and assist Temple Master Quan-Jang in shifting the planet back towards the light side of the Force and restoring balance.
Soon after, Xesh, a Force-sensitive individual from off-world, was brought to Mahara Kesh along with some Je'daii who had been hurt while trying to capture him, including Quan-Jang. Calleh provided medical attention to both Xesh and the Je'daii Journeyer Sek'nos Rath, and she was checking on Xesh when he regained consciousness. Calleh expressed her empathy for the difficult life Xesh had endured, evident from the numerous scars covering his body. The Selkath informed the stranger that he was currently at Mahara Kesh. Calleh and Naro continued to care for the injured over the following ten days, after which the Council made the decision to exile Xesh—whose strong presence in the dark side of the Force had been a contributing factor to the recent storm—to the moon of Bogan.
Calleh, being a female Selkath, had a single tendril extending from the back of her head. Her eyes were black, and the skin on her head displayed a pattern of dark and light blue shades. The remaining portion of Calleh's skin was a pale grey-green hue. She also had two black-and-silver rings threaded through the lobes on the sides of her head. She felt a deep sense of compassion for Xesh upon realizing the extent of violence he had experienced in his life. Calleh was also a highly skilled and knowledgeable healer, holding the esteemed position of Temple Master at the Temple of Healing.
The first mention of Calleh occurred in preview issue 0 of the Star Wars: Dawn of the Jedi comic book series. Her initial appearance in the series was in its fifth issue.