Vex doesn't appear to have a family and was born during a time in which Vardaros had been corrupted by the crime lord known as the Baron. To get by, Vex spent the first of her teenage years operating as a loner and running an illegitimate business that specialized in blades and other weapons called "Knives & Such". On the surface, she is extremely antisocial and unapproachable, though she is willing to work with anyone for the sake of money. Despite her shrewd behavior, she has an untapped sense of justice—one of which she finally embraces upon meeting Vardaros' legendary sheriff, Quaid.
Role in the series
Vex first appeared in "Beyond the Corona Walls", where she is paid by the Baron's henchmen to lure Eugene and his friends into a trap. Later on, Rapunzel enters the city in search of Eugene, to which Vex notices. The teenager taunts Rapunzel on her loss, angering the latter to the point of interrogation. Despite Rapunzel's threats, Vex refuses to talk. In truth, Eugene had been kidnapped by the Baron and forced into marriage with his daughter, Stalyan. Vex gets roped into catering flowers for the event, and encounters Rapunzel while doing so. The princess pays Vex to sneak Cassandra and Hook Foot into the wedding, which Vex goes about successfully.
In "The Return of Quaid", Anthony the Weasel takes over Vardaros in place of the fallen Baron, and looks to expand his reign by robbing the people for all they're worth, including Vex. This motivates Rapuznel to start an uprising, but the princess has difficulty rallying the townsfolk to fight alongside her. According to Vex, this is because Rapunzel represents everything the people in Vardaros hate. However, Eugene and Lance note that the city was once protected by its local sheriff, Captain Quaid, though he quit the job before Vex's time, leaving the Baron to rule unconditionally. This gives Rapunzel the idea to bring Quaid out of retirement. Vex—knowing his whereabouts—is paid to lead Rapunzel and her friends to Quaid's cottage.
Upon meeting Quaid, they learn that he left his position due to the people of Vardaros refusing to help him fight against the Baron's tyranny—Vex's jaded nature only reaffirms Quaid's fear that the people of Vardaros are just as cynical and uncaring as they've always been. This prompts Rapunzel to stage a robbery, orchestrated in such a way that it reestablishes Quaid as the city's hero, and give hope to the people. The mission is a success, and with Vex by his side, Quaid regains the people's trust. A celebration is later held at Quaid's cottage, where the sheriff enlists Vex to work alongside him as his deputy. Vex accepts, though she coyly tries to hide her enthusiasm.
Unfortunately, Quaid comes to realize that the first robbery was merely a ruse conducted by Vex and Rapunzel, tarnishing his confidence. Quaid quits once more, leaving Vex to face the Weasel and his goons without him. Rapunzel, Eugene, Lance, Cassandra, Maximus and Hook Foot stand by her side, but they meet their match in the form of the Collector, a bounty hunter. Before the Collector can eliminate Vex, Quaid returns. He and Vex work together to defeat the Collector, forcing Weasel to retreat, and placing the city back into their hands.
In "Goodbye and Goodwill", Rapunzel and her friends finally make their leave of Vardaros. Vex and Quaid are there to see them off, and although Vex is seemingly apathetic about Rapunzel's departure, Quaid urges Vex to at least thank the princess for all she's done for the city. Vex does so, and upon Rapunzel's departure, she raises the new city banner created by Rapunzel.
Vex is last seen in a group shot at the towards the end of "Plus Est En Vous".