Guardian Angel

Guardian Angel is a character briefly shown in "Dungeon," seeming to help Finn by healing all his wounds (because he didn't have Jake with him). However, the Guardian Angel then turns into a hideous monster and puts him into a cage, intending to cook Finn into soup and eat him. She is also seen playing the Glockenspiel. She can take away scars, mend clothes, and heal wounds by touching that person with a lit up finger, much like E.T. Though she is a Guardian Angel, she wants to cook Finn and Jake into a stew and eat them. She was apparently killed when the cage that she put Finn and Jake in collapsed and crushed her. She may also have taken Jake when he failed his challenges. She also can be a demon and taking the form of an angel.

Trivia

 * She bears a resemblance to the zoroastrian concept of guardian angels, mostly in appearance and purpose.
 * She can apparently change her face, along with her voice, from beautiful to hideous.
 * She is the 2nd weakest monster in "Sound Castle" that takes three hits to kill.
 * She can play the glockenspiel.