Doppel

SPOILER WARNING!

A Doppel is a combination of a Witch and a Magical Girl that is created when a Soul Gem filles when in Kamihama City. Doppels assist in battle after the user has come to peace with their despair and are usually very powerful. The reason for Doppels being created is Ui Tamaki's Witch, Shitori Egumo, absorbing all the despair within the city.