Kuru Shimi

"I wish to feel no pain."

Kuru is one of the many girls tricked by an incubator into becoming a magical girl. Her wish was to feel no pain, physically or emotionally. Before she became a magical girl, she was just an average student who faded into the background and didn't really have any friends, but afterwards she became confident and noticeable due to her lack of emotional pain- and thus inability to feel shame or embarassment. One could even say she became popular, though not intentionally.

She got most of her scars in a fight with a witch before becoming a magical girl. Another magical girl saved her and left immediately, never to be seen by Kuru again. Kuru, in agony from her wounds and fear that she would die, made her wish and an incubator granted it, of course at the price of becoming a magical girl. In some timelines, she becomes Animus Cruciatus, the witch of smiles. However, since she can't feel emotional pain, her soul gem muddies very slowly, so she usually survives.