Physical appearance: Yui has neck-length forest-green hair. She has light skin, and ghostly, bright red eyes with slit-shaped pupils. Yui's most noticeable traits are her cat-like ears and tail. Yui also has fangs and claws. There are two U-shaped flaps on each shoulderblade, under which lie rocket boosters. Two holes can be found on each inner arm and leg, where excess heat is vented. Yui has bloody stigmata on each palm and on her spine. Her left breast is bears the tattoo: "Property of the Empire, B-0323-12a NK-2k1, accompanied by a bar code.

Personality: Yui is somewhat rare. At times, she is rather cute, and sweet. Sometimes, however, she can be as cold, cruel, and brutal as the machine that raised her. She hates herself for all of the horrible things she has done to those who loved her, but won't let that stop her from having a good time. She is somewhat distant, and a lone wolf who sees her loves as another form of prey. Everything is the hunt for Yui. And Yui won't stop, even after death.

History: Yui was created by the Lord Emperor Uesureyu in response to the lack of persons available after the wars between Heaven and Earth. After the plagues released by both sides had subsided, survivors were cloned, and new types of humans were created. Yui was designed to be a new type of military weapon, her DNA based on what was supposed to be the perfect, original woman, Karen. Assisted by the gods, Yui was made in the image of the emperor's imagination.

Yui was raised by a war machine left over from the great wars, and by a slave woman. She grew up in the gardens of kitsurugi no iori, training and hunting until the supervision of her cruel robot daddy. Yui felt unloved by her parents, because the robot had beaten and threatened Yui's mother with death not to show love.

Beginning when Yui was 16, she began taking missions to visit various other realms, and fighting there. At 17, she was commanding one of the armies that liberated hell. Now, she prepares to face her greatest challenge ever, taking over heaven.

Website: Kitsurugi Yui