Elatia

Elatia is a female humanoid character who appears in the Smurfs fanfiction story "Polaris' Fantasy". At first she appears unto Polaris Psyche as what seems to be a creation of the Imaginarium, but as Polaris and Empath Smurf find out, she is actually a disembodied spirit whose body was trapped in an Imaginarium crystal for several centuries and got tired of living in a fantasy land. To that end, she used Polaris in order to take possession of Smurfette until a new body could be created for her, which put incredible strain on Smurfette as she struggled to keep herself from being destroyed by Elatia. Ultimately Elatia's spirit was purged from Smurfette's body when her life signs began to fail, much to the disappointment of Polaris who had come to have fallen in love with her.