Namine is a character in the video game series Kingdom Hearts, first appearing in Kingdom Hearts II (going by release date, not chronological order of the games).
She is the Nobody of the character Kairi. Nobodies are made when a human with a strong heart has their heart taken by Heartless. She can manipulate memories and did so in Castle Oblivion to lure Sora in for Marluxia (against her will!) Namine is an amazing artist.
Organization XIII members call her a witch.