Lucia is a strong, young girl who leads the fights against Viruses alongside the other members of the Venus Vanguard, sworn to fight and kill all Viruses. She is battlehardened and cold, but she shows a lot more facial expressions in the manga than in the anime. Her left eye holds a mysterious power, though is almost always covered with an eye patch. Use of her powers is taxing and wears her out, but can often be disastrous to her enemy in many ways. Her left arm has a symbol of the enchantment succeeded from her father. According to Sumire, Lucia often gives off a faint fragrance of roses, which is a scant memory of their intertwined pasts. She smokes in the manga.
Source from Wikipeida