Memoria's vial is a small golden cage with a pillow, in which she resides. Her ability revolves around the creation of keys. For the most part, she can manifest skeleton keys that can turn any door into an entry to another destination--including one that can open her cage-vial, which she is unable to use herself. However, the ability she is most known for is one that only works the closer is able to get to someone. Upon touching someone's chest, Memoria is able to create a key that essentially "unlocks" the other's heart, allowing her to trap their emotions and memories within a cage that she can keep within her vial or to actually place a previous heart's memories and feelings within them. She can also leave behind obsessions within an unlocked heart. Memoria believes she is performing a great courtesy by spreading "love" like so. Alternatively, she can manifest wind-up keys on others' backs, which will forcefully make them dance with either her or another affected partner. If she is not satisfied with the results, one may very well end up dancing for hours or days. Some humans have met their demise this way.

While she has a kind and gentle demeanor, Memoria is incapable of understanding the full range of emotion is notorious for her obsessesion with love. She cannot experience anger, fear, sadness, or pain, but seems to be able to detect it within others.