A Homunculus placed in a care of Queen Diene some years previously, Mercedes has a poker face that shows little emotion, but she grows quickly attached to those who show her kindness. Sometimes, she may awkwardly mimic others or repeat what they say.
Speciality: Stacking stones
Hobby: Counting patterns, observing insects
Likes: Roses, black tea, you
Dislikes: Anything that gets in your way

She now wears a white body suit with cat-like ears (costume) and fluffy tail (costume).