Thirishar ch'Thane, or "Shar", was an Andorian chan who served Starfleet during the 24th century. He served as science officer aboard the USS Tamberlaine and Deep Space 9 from 2375 to 2376.
In February of 2376 Shar was assigned to Deep Space Nine as science officer where he swiftly befriended station Chief of security, Lieutenant Ro Laren and chief engineer, Lieutenant Nog. When he and Nog were sitting inside Quark's bar, Shar's antenna detected the shrouded Jem'Hadar, Kitana'klan. It was Shar's quick action that followed that exposed the Jem'hadar's presence.
Shortly after arriving on DS9, Shar began getting pressure from his zhavey to return home to Andor and participate in the shelthreth, the Andorian mating ritual, with his three bondmates. One call from her left him so infuriated he shattered the com unit with a sharp kick.
The Andorian species, which requires a union between all four genders (chan, thaan, zhen, and shen) in order to reproduce, and had an ever shrinking window of fertility, was under going a reproductive crisis and was slowly dying out. Charivretha believed that Shar was ignoring his duty to his people by not returning home and adding to the population. Shar felt that the Andorian people were just delaying the inevitable and sought a more permanent, scientific, solution.