She is completely devoted to Ladd, who says that "after everyone else, the last one he will kill will be her". She was present on the Flying Pussyfoot incident, where Ladd sacrificed a hand to save her.
Lua is very calm and gentlewoman-like, and her love for Ladd is pure as she would put her life in danger for his sake.
In the original light novels, It is stated that she enjoys putting together blank jigsaw puzzles, which she takes pride in completing. However, Ladd always breaks them after she completes them.