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Kyoko is a veteran Puella Magi who comes to the city following Mami's death. Her distinguishing features include long red hair, twin fangs and a voracious appetite, almost never being seen without food. She came from a poor church family and used her wish so that people would listen to her father's preaching; however, when her father learned of this, he went mad and killed his entire family. As such, Kyoko decided only to use her magic for herself, since using it for others will only cause despair. Having grown up in a poor family, she often has to steal food and hates people who waste it, a logic she also applies to Grief Seeds, as she only goes after fully grown witches.

Source from Wikipeida