Lucia (ルキノ, Luchino in the Japanese version) is a young lady descended from Count Delbray's house, and is the older sister of Geoffrey. She is Elincia's milk sister and her dearest friend from their youth together. She is also often the subject of long rambling love declarations from Bastian who seems to be smitten with her. Lucia is an outstanding swordswoman, and is constantly challenged by duty and formality. Lucia commands the Royal Guards alongside her younger brother Geoffrey and also sets up a clandestine network of spies to monitor activity inside of Crimea.
She is a calm, wise, rational, courteous and quite capable person. Lucia holds absolute loyalty to Elincia, she would do anything for her, no matter how difficult or how unreasonable, even if it will endanger her own life. She is also noted as a good cook, as Ilyana says the meal Lucia cooks is delicious. Lucia has a sweet tooth, and as such likes to eat sweet things. It seems that Heather finds Lucia to be a great person. Also, Ilyana regards Lucia as a very beautiful and strong woman, and even though she may be less than 20, she is a prime example of an advisor to Queen Elincia.