It is explained to the audience that Liru is a werewolf and dislikes silver. Liru has an energetic personality and has animal traits such as the ability to leap great distances with little effort. Like all werewolves she is lycanthropic her wolf form looks similar to a yellow puppy. A minor reocurring theme in the episodes is when Liru sees a full moon shaped object she immediately changes into her lycan form though strangely enough she seems somewhat resilient to the real moons effects. Source:Wikipedia