Carmilla is one of the Witches of Sin, being the Witch of Lust. She has no self confidence, being timid, and tends to have downcast eyes. Despite this, others find her similar to a scared animal, making them attracted to her.
SpoilerCarmilla's main ability is "Authority of Lust". With this Ability, Carmilla is able to captivate people, making them absorbed in her atmosphere to the point they wouldn't be able to know if someone were to hurt them. She can also make Individuals believe they are seeing and hearing what they want to see and hear, an example is when Subaru saw Rem and heard her when facing Carmilla.