Cubus

The Cubus are a group of spirits that exist in the EMPATH: The Luckiest Smurf story series that prey upon lonely souls and latch onto them through the act of sexual intercourse, bonding with them and draining them of their life spirits to sustain their own, usually to the point where the Cubus spirit kills the person it has bonded with.

In "Grouchy And The Love Doll", a Cubus spirit inhabited Grouchy's love doll named Angel and has assumed the personality of the love doll in order to give Grouchy the love it feels he deserves. However, when Grouchy is found unconscious in his own house due to an act of intercourse with the now animate doll, Angel reveals that she is a Cubus spirit and that her physical form must be destroyed in order not to attract other Cubus spirits to the Smurf Village to prey upon the souls of the other unmarried male Smurfs. When Tapper is told by the direction of the Almighty to have Duncan fire an unknown packet into the sky with a bow and arrow to cause a thunderstorm to appear over the village to cleanse it, a lightning bolt came down and struck Angel's physical form, instantly incinerating her and thus putting an end to the Cubus spirit's physical form.

The Cubus are based on the legend of the incubus and the succubus, demonic beings that prey upon people through the use of sex.