This is Kanari Tsubasa from the anime Senki Zesshō Symphogear.
Senki Zesshō Symphogear is a Japanese anime television series produced by Encourage Films , aired on Tokyo MX between January 6 2012 and March 30 2012.
A second season, Senki Zesshō Symphogear G, will begin airing in July 2013.
Kanari is an idol that faught evil nemesis Noise who uses Symphogear as their gear. She was formally a part of a duo known as ZweiWing, but her partner Kanade, sacrificed herself fighting the Noise and she has since been fighting the Noise alone.
Kanari Tsubasa requires 7 sheets of paper to build