One of the main characters in Rebuild of Evangelion.
She is Souryuu Asuka Langley, but her last name has been changed to Shikinami (式波).
Her original name, Souryuu, fits with the theme of Evangelion characters whose surnames are taken from Imperial Japanese naval vessels. However, it is not consistent with other characters whose positions within NERV relate to their namesake ship's class.
Specifically, the old name Souryuu comes from an aircraft carrier which places Asuka at the same rank as Akagi Ritsuko and Katsuragi Misato. The new name Shikinami correctly places her among other destroyer namesake characters such as Ayanami Rei and Makinami Mari Illustrious.
If it is not immediately obvious which version of Asuka is depicted, do not use this tag unless Pixiv tags or other artist descriptions identify her as such.