Yandere (crystal)

A Yandere crystal is a magic crystal that Handy Smurf used to make the Doll Smurfettes come to life in the Smurfs: The Devereaux Story episode "My Special Smurfette". However, unknown to Handy until later, the Yandere crystals also gave the Doll Smurfettes dangerously possessive personalities that would not let their male Smurf companions seek for any relationship outside of their own.