Mazagalanthi was a male Lissepian who lived in the 24th century. Following his escape from the Letau prison facility, he became one of Iliana Ghemor's lieutenants, although he believed his leader was Kira Nerys.
Mazagalanthi operated as a smuggler and specialized in the trafficking of classified technology. He was later imprisoned by the Cardassians on Letau. In 2375, the Letau facility was damaged after a Romulan starship was forced down by the Jem'Hadar, allowing Mazagalanthi and other prisoners to escape their cells. Mazagalanthi and Fellen Ni-Yaleii fought their way from the cells and encountered Iliana Ghemor, Shing-kur and Telal. Mazagalanthi later worked on a Dominion transporter which the group used to transport to Harkoum.
In 2377, Mazagalanthi, Shing-kur, Fellen and Telal were captured by the crew of the USS Defiant on Harkoum and brought to Deep Space 9 for interrogation. After Mazagalanthi learned that "Kira" was actually Iliana Ghemor, he planned to make a deal with Cenn Desca. He never got the opportunity to do so, as Shing-kur activated an implant in his brain that released a neurotoxin that killed him in seconds. (DS9 novel: Fearful Symmetry)