Miku Zatsune is Miku's "dark side" with a red theme instead of teal. She is said to be a daring or sexy version of Miku (sometimes as evil too), and is said to sing songs with sexual content.
In Japan, she was depicted as a parody character, an evil Miku.
Her voice is basically Miku's but lower pitched, but TreylolzXD came up with a voice configuration for her in the Vocaloid software.screms
|BREATHINESS (BRE)||-5||BRIGHTNESS (BRI)||10||CLEARNESS (CLE)||25|
|GENDER FACTOR (GEN)||14||OPENING (OPE)||20|
In line with the theme of being risque, she works best with Miku Sweet append, and some portamento, for the swooning effect.