Lilly is a meek and shy girl who is highly knowledgeable about the Spiritual Church and her religion. She often stutters and refers herself as "Lilly" when she speaks. In addition, she is prone to be easily startled and accidentally insult others whenever they act inappropriately.

Spoiler

She has a split personality. Normally, she is a shy individual who often stammers when she speaks. However, due to experiments done by her father when he was trying to artificially create a dual-caster, a second personality was embedded within her. This side of Lilly is a ruthless assassin who follows Salas.