Troisienne is the third-generation clone of the original Lumière, preceded by Uni-ace and Dionie. Created by Eclipse, the former director of the Galactic Trade Organization, through the use of quantum abilities, she was paired automatically with her partner Trixie, the third clone of Éclair. Together they served as the strongest ES (Encounter of Shadow-work) operatives for the GTO.

Her primary ability allows her to stop time completely, though each use inflicts severe physical strain and fatigue, limiting its application. In demeanor, Troisienne is quieter and more composed than Trixie. She is admired by both Ascoeur and Q-feuille, with a particular closeness to Q-feuille due to their shared otaku interests—including an affinity for the anime series *Card Getter Sakura*, a trait believed to be hereditary among the clones.

Shortly after her own creation, another Lumière clone emerged who would become Q-feuille. Troisienne regarded her as a younger sister, and the two developed a strong bond. Troisienne’s death was abrupt and brutal, occurring during an assault on the GTO where she and Trixie were both killed. Their loss deeply affected Ascoeur and Q-feuille and marked a tonal shift in the series. Her full name, Troisienne III Lumière, is engraved on her tombstone, affirming her identity as the third clone.

Among her notable actions is an instance where she sucked Ascoeur’s finger. Her official date of birth is October 12.