Yuna Amasato

One of the two "Peaky Angels" twins. She and her sister are allied with Ruler. She wears an angelic-style dress, and has one wing for her outfit. Her ability, complimenting Mina's, allows her to shapeshift into any living being.

[Spoiler] She is the fifth magical girl to die after she is killed by Winterprison, her head being smashed into a wall, breaking her skull... [/Spoiler]

(Source: Wikipedia)