Yandere/Theater

""Yeah, I know. the jerk's waiting. So go. I haven't got a gun. Yet.""
 * Abigail Williams from The Crucible fits this trope like a glove. After her boss John Proctor ends their affair, Abigail jumps at the opportunity to have his wife Elizabeth arrested and executed for witchcraft.
 * The Phantom of the Opera: Erik, the eponymous Phantom, towards Christine.
 * To be more specific, Erik captures Christine's lover and gives her the choice of being with Erik forever or watching her lover die. Ironically Christine chooses Erik which snaps him back to sanity and he frees them both to be together.
 * In the theatrical sequel Love Never Dies, has become one: she
 * Jackie-O from The House of Yes.
 * Canio from Pagliacci
 * Lady Macbeth from Macbeth
 * Helena from A Midsummer Nights Dream
 * Lucy from 13 is a milder version of this trope. She looks like your Average Self-Concious Teengage Girl, but just mention Brett and she becomes Clingy Manipulative and Bitchy. She may not be willing to murder, but she is willing to ruin a few social lives.
 * Salome, the Princess of Judea at the time of Jesus, is this toward Jokanaan (John the Baptist) in both the play and the opera about her. Whenever she's around Jokanaan she can't stop saying "I want to kiss your lips!" When he, predictably, wants nothing to do with her so long as she remains uninterested in Christianity, she uses a seductive dance to trick her stepfather, Herod, into giving her "anything she wants," which ends up being.
 * Count di Luna for Leonora.
 * Amneris for Radames.
 * Eboli for Don Carlo.
 * Donna Elvira for Don Giovanni. She gets better.
 * Don José, for Carmen.
 * Depending on the interpretation, from The Turn of the Screw. This only works in the interpretation where
 * Bluebeard, for Judith and
 * Wozzeck, for Marie.
 * Brünnehilde for Siegfried, in Götterdämmerung.
 * Oh, Nessarose...
 * Andrea, in one of the skits of Voices From the High School.