Again, work from the ground up. Why is she a fiery seductress? What caused her to be that way: A strong need to stand out? A lack of attention while growing up that's now being compensated for? Innate good looks which were weaponized? Because she liked the color red and went with the persona? Because it was her favorite character growing up?
Whatever the answer is will define her strengths and limitations (which are important to a good villain)
For example:
She grew up in a slum below the bridge. She was the youngest child on the street and often picked on for her thin legs, 'Chickin Legs!' they'd gleefully cry every time they saw her. Soon she would learn to keep her head down, and run home, whenever she could hear them nearby. Small, pained tears would strike the ground in the wake of her steps. None of her siblings had the time nor will to stand up for her, and her mother was too busy running the house alone to care. At the age of 8, in a stroke of fortune her father finally found a well paying job in a coal mine. While the hours were long and he would come home everyday with a raspy cough, he was able to put good food on the table for all five of his children, children whose names he could hardly recall after a night of drinking the pain down.
The years passed, and one day she woke, and found herself no longer fitting her rough clothes. Her legs were long and voluptuous, her almond eyes were beckoning, and she was growing into a beautiful woman on the outside. When she walked out onto the street it was to wolf whistles, not jeers. Countless boys vied for her attention, but she never forgot her childhood, and those long, cold nights crying alone. She never forgave. She brushed them off, one by one, relishing the role of the taunter, and not being the victim. She excelled in education, and kept an active social life. She sought out the noble lords' sons, those vainglorious wretches, and through them tasted the power wealth brought. She was not an ice queen however, and on her weekends she spent time at the orphanage, helping those who had no one else to reach out for. She helped them for herself, in the hope that others would not have to suffer the pain and solitude she once had.
By the way, did you come across a name for the girl in those last two paragraphs? ;)
Figure out WHY she is what she is, the name will come on its own.
Alternate solution: Pick out portrait headshots of characters in existing media that fill this archetype, see if they inspire a name.
