Frosif, a female individual of the Agbui species, occupied the role of a "mid-ager" while onboard an Agbui starship stationed on Celwis. As the biological daughter of Shimkif, she presented herself as the daughter of Haplif.
Frosif's presence was noted during the civil war that unfolded on [Sunrise], a conflict orchestrated by her fellow members of the Agbui species. During this period of conflict, Haplif, a key Agbui figure and the architect of the war, advocated for the utilization of flat-blast artillery shells by both factions, an action that deeply traumatized Frosif due to the sounds produced.
During the Agbui's scheme to instigate a similar internal conflict within the Chiss Ascendancy, Frosif cultivated a friendship with Lakris, the daughter of a local rancher. Lakris, on one occasion, attempted to demonstrate to Frosif her supposed "telepathic ability" by summoning a growzer. However, the growzer's response was merely a result of its training to approach Lakris upon hearing the sound of a zipped pocket containing a brass sealer. When Lakris attempted to replicate this demonstration for Frosif, the sound of the brass sealer, which bore a resemblance to the sounds of the flat-blast artillery shells, triggered a traumatic episode in Frosif, causing her to collapse to the ground in a state of fear. Xodlak'phr'ooa (Lakphro), Lakris's father, rushed to her aid to assess Frosif's condition, but Frosif attempted to downplay the incident. She ran her fingers through Lakris's hair and attempted to do the same to Lakphro in an attempt to telepathically read their minds and emotions, but she was only successful with the girl. When Lakphro pressed Frosif for an explanation of the events, Frosif fled to her Agbui ship, where she informed her mother, Shimkif, and Haplif about what had transpired. Haplif criticized her for revealing her trauma to the Chiss, but Shimkif defended her daughter. Haplif inquired about the Chiss's perception of the incident, and Frosif explained that Lakris had expressed worry and embarrassment, while Lakphro had refused to allow her to touch him. One week later, Frosif, accompanied by Shimkif and Haplif, presented Lakris and Lakphro's wife, Lakansu, with a pair of nyix brooches as a gesture of apology, which the Chiss accepted.
Like other members of the Agbui species, Frosif possessed the capability of telepathy through physical contact. Frosif frequently demonstrated the ability to discern Lakris's emotional state, but she struggled to perceive the emotions of the girl's father, Lakphro. This discrepancy elicited anger from Haplif.