Death Note - Shinigami / Death God Rem

Rem: She’s Misa Amanes Shinigami.
  She took control as Misa Amane’s Shinigami when one of her fellow shinigami
  died trying to make her life span larger. She cares deeply for Misa Amane because
  her heart is pure. Rem possesses two death notes because of the one she gained
  when her friend died plus she also had her own. She shows that she cares for
  Misa when she saids if Misa Amane dies before her time she will write yagami
  lights name on her death note book.