Rei Ayanami
A related sub-type is a character version, where a voice actor or actor sings a song from the series as the character. A famous example of this are the various versions of "Neon Genesis Evangelion"s theme songs, redone by the voice actresses of Rei Ayanami, Asuka Langley Soryu and Misato Katsuragi. They are usually identified by a "version" tag at the end of the name (e.g. "Cruel Angel's Thesis, Ayanami Version").