Qarin

A qarin is an arabic guardian angel of sorts, duty-bound to a human being. One appears in "Ghoul Goblin".

Description
Though often classified among the Djinns, with which they share some characteristics, Qarin (literally "constant companion") are distinct entities; spiritual doubles of human beings, either as an extension of them or as individual creatures.

"Ghoul Goblin"
In "Ghoul Goblin", a Qarin has fallen in love with Cynthia Cedar, saving her from an attack by a number of magically reanimated mummies. He follows her to Boone Mill.