Lucaria is a girl who ages very slowly, she is actually around 20 years old in mind and spirit, but she looks only around 8 or 9. She was raised in a magic guild where she learned to use ice magic. (She also uses this as her primary form of fighting.) She lives on her own on a snowy moutain, and until she meets the main cast, she lived a solitary life with Lucifer. She is kind, but she is impatient. Whenever a battle approches, she wants to get it over with. She loves to read, and she owns a huge library. Her mission in life, is to collect every book in the world. 

I imagine her with an extra cutesy, soft voice.