Vexus
Vexus was the reigning monarch of Cluster Prime and commander of the Cluster, and is still one of XJ-9's most common foes. She rarely gets the upper hand, however. Her name is likely a pun on "[vex]-us".
Vexus and Nora Wakeman have been opponents for what must have been quite some time, and Vexus was likely the inspiration for XJ-9's creation. XJ-9 typically can outwit and outperform Vexus, but regardless, Vexus' has the resources of an entire planet to call upon, so occasionally she does gain the upper hand- but typically through trickery and sabotage.
She possesses the ability to transform, but typically for means of disguise, compared to the multitude of battle forms that Jenny typically uses.
In Escape from Cluster Prime, it is revealed that Vexus has a daughter, Vega. During the course of the film, Vexus is dethroned by Jenny and Nora Wakeman (with Sheldon's help) and Vega takes the leadership of Cluster Prime for her own.
Being two thousand years old, Vexus' skill with slang and relating to teenagers is a bit rusty. In an attempt to infiltrate Tremorton High, she dressed like a Flapper and spouted all the hottest 1920s lingo like "bee's knees" and "23 skiddoo". An animated version of her appeared in The Simpsons right by an episode called "Flaming Moe's".
