Urlum the Usurper

Urlum the Usurper is a sci-fi/future history series by Litia Von Lucerna, who is currently working on novels revolving around the timeline. The series presents the story of Urlum Eudae Kaywell, an alien called a "tabulon" native to the planet Uingffh. She lives a peaceful life on Uingffh as the third princess of the Kingdom of Kaywell until one day, the human race arrives and invades her world. In response, she rebels against the imperialist/colonialist power established by the humans: the Holy Empire of Earth-Kalgamania, which views tabulons as an inferior race. After defeating the humans' empire, Urlum goes on to experience a radical change in morals and political views and establishes her own totalitarian fascist dictatorship, which promptly invades Uingffh's star system and comes to view humans as an inferior race. Her dictatorship then conquers several dozen star systems surrounding Sol and Ingffhaestia, orchestrating numerous genocides against non-tabulon races in the process before being dismantled by a rebellion led by human Macia Mallory several decades later.

Note that this timeline is currently undergoing a major revamp.