Ultima/Chronology

Scarlet Bond
Violet serves as a minor antagonist of the film, being Lacua's master and the creator of Towa's cursed tiara. When Diablo learns of the tiara and the magic circle polluting the waters of Raja, he confronts Violet, suspecting her involvement. After some banter between the two, Violet reveals the details of her connection to Raja's royal family. Diablo then requests that she leaves Raja alone, informing her that Lacua had acted outside her orders and violated the contract she established with the royal family. Fed up with Diablo's attitude, the atmosphere turns violent, with a fight breaking out. While the two are relatively even at first, the magic body Violet created begins to disperse. Though Violet desired to keep fighting, both her servants stepped in and convinced her to withdraw. While leaving, she learned the identity of Diablo's master.

Later on, when Rimuru has Lacua at sword point, the latter attempts to threaten him against incurring the wrath of his master. Just then, Violet's voice is heard, disparaging Lacua for violating her contract with the royal family and abandoning him. When Towa sacrifices herself to save Hiiro, Violet resurrects her as thanks for the entertainment she and her ancestors provided her.

Trinity in Tempest
Following the events of Scarlet Bond, Violet takes an interest in Tempest and enters the material world, taking the form of a cat to conserve her power. To enter the country, she sneaks into Nemu's bag, mostly on a whim due to finding it "suitable" at the time. She spends the next several days travelling through human lands with the main characters; and though she has taken an unexpected detour from her original goal, Violet finds no problems and is enjoying her life as a cat, much to the distress of her two direct servants who wish for her return to her domain.

At one point during her travels, she considers assisting the main trio when they overwhelmed by Orthrus, but decides not to when Touka shows up.

Hero Awakening
Violet is recruited by Diablo who is looking for subordinates to help out with his "chores". At first, Rimuru thought she wasn't strong but Raphael quickly corrected him. She energetically introduced herself and pledged her loyalty to the demon lord. Her mannerisms and appearance were so cute that Rimuru doubted she was a daemon at first.

She gained a physical body by inhabiting a Pseudo Soul and one of the many golem skeletons prepared by Rimuru. Her skeleton was slightly modified by Rimuru to retain her beauty, and gold was mixed in to it, turning the magisteel into orichalcum. After successfully gaining a body, she along with her two hundred soldiers were given names. Her two direct servants were named Veyron and Zonda. Ultima and Veyron evolved into Daemon Lords while Zonda's limit as an Arch Daemon was released.

She was then assigned to be Chief Prosecutor of the Public Prosecution Office in Tempest. Ultima accepted the job happily and looked forward to it, frequently patrolling the streets and cracking down on crime.