Mei Sudou

Mei Sudou (須藤メイ) is among the female protagonists of the story. She is an artificial human. She was not born, but created, by having many genes inserted into her being to make her who she now is. Like Rushella, she also possesses very attractive body features. She also has blonde hair shaped in a ponytail that is banded by a green ribbon and emerald green eyes. Her genes were picked out for her in a way similar to how Victor Frankenstein picked the genes he used to create the first artificial human. The big difference is that she looks wonderful and the monster Frankenstein created was creepy, to be kind. She dislikes being called anything derogatory for an artificial human being, as she usually reacts in a bad mood. Mei was a spy for Eruru, to see how the relationship between Hisui and Rushella would progress, and to also see if Hisui had already become a vampire. Rushella had known the whole time that Mei was an artifical human the moment she saw her. Hisui on the other hand did not know so easily, though he had her suspicions. But it was only when he saw the mark on her right leg (FC-XX07) that he began to realize she was also not a natural born human.

One of the key traits of an artificial human is their unnatural strength. This is one of Mei's biggest abilities. She possesses a level of strength considered to be overwhelming. Hisui learns this the hard way when he is mounted by her during the second chapter of the first book. Frankenstein;s monster had a high level of brutality, so all artificially made humans have an overwhelming amount of strength. Mei puts a limit on how much she uses in order to keep herself from being noticed by the rest of the school. It is also said that she possess half of the strength of Frankenstein's monster. This is bad for Hisui because he is usually victim to whatever she wants of him unless he wants to be subdued into doing it anyway.

When she is first introduced, Mei immediately tells Hisui how she feels about him, but is hurt when he keeps trying to avoid her advances towards him. After understanding how he considers emotions to be, and realizing, his perspective of love, she stops for a short while, but she is still in love, and throughout the story, she keeps making a move on him, trying to win him over. Because of this, she ends up being Rushella's love rival, and also gets mad whenever she sees him with another girl who is trying to gain his approval.