Theodora

~ Theodora, after her transformation into the Wicked Witch of the Witch.
Theodora the Wicked Witch of the West is an antagonist who appeared in the 2013 Disney fantasy film Oz the Great and Powerful. Theodora is a beautiful, naive witch who is protected by her powerful sister Evanora. Theodora only wants peace to come to the Land of Oz and truly believes that Oscar is the great and powerful wizard they've been waiting for, or so we think....

Appearances
Oz: The Great and Powerful Theodora first appears when Oscar Diggs first lands in Oz, believing him to be the focus of a prophecy after seeing him perform a few simple magic tricks, which she believes are real magic. Theodora tells Oscar that the wicked witch Glinda killed her father, the wizard and king of Oz, but upon his deathbed, it was predicted that a great and powerful wizard by the name of Oz would descend from the sky, save the land, and become their new king. Unfortunately, they are discovered by a winged baboon, one of the Wicked Witch of the East's minions. Oscar manages to distract it with one of his doves and the two escape. By this time, Theodora reveals she is also a witch, but a good witch. The two camp out for the night before heading to the Emerald City, where Oscar follows his womanizing ways and gives Theodora a music box; she develops feelings for Oscar, who she desires to rule with as queen, and clearly falls in love with him whereas he rebuffs such commitment. They come across Finley, a winged monkey trapped in vines. Wishing to see Oscar in action, Theodora asks him to free the creature. Unfortunately, a lion appears and tries to pounce on Oscar. Fearing his life, Oscar creates a haze to scare it off. Finley pledges a life debt to Oscar. The trio arrive in the Emerald City, as Oscar and Theodora make their way to the throne room that previously belonged to the king. Theodora's sister Evanora appears, seemingly gracious that the wizard has returned to help them stop the Witch's reign of terror, then asks him to join her later on to learn about him. As Oscar leaves the room, Evanora scolds her sister for bringing an imposter to Emerald City. Theodora tries to defend, believing that Oscar is really the wizard who will save them. In her anger, she accidentally sets off her own magic to a nearby torch. To this, Evanora slyly asks Theodora if this is really what she wants, or if she is just as wicked as the witch to wanting to aid her. Later, Theodora comes into the throne room and sees her sister spying on Oscar, she questions what happened when Evanora was with Oscar. Seeing Theodora's potential for evil, Evanora lies to her claiming that Oscar seduced her that night and promised to make her queen after he kills the Wicked Witch. Hearing this, Theodora cannot believe it, but Evanora uses the exact words Oscar said to Theodora to make her claim seem legitimate. As the two sisters continued to watch Oscar's journey, Theodora became heartbroken at Oscar's betrayal as he joins forces with Glinda. Playing on her sister's lust for revenge, Evanora offers her a green apple that will give her the strength to beat him. Theodora immediately takes a bite from it, but afterwards she realizes that Evanora was the Witch all along, however she is too late to realize this as Theodora begins to transform into a hideous, green-skinned version of herself. Pleased, but in shock of her sister's new appearance, Evanora tells her she can cast an enchantment to mask it, but Theodora angrily yells no as she embraces this new form as the Wicked Witch of the West. As her first act, she flies to Munchkin Country and easily breaks through Glinda's barrier. Landing in the town's square (as an allusion to the witch's first appearance in the 1939 film), she confronts Glinda and Oscar, the latter being unable to recognize her. Reminding Oscar of the time they spent together, Oscar remembers and realizes the Witch is Theodora, however the Witch of the West then uses her magic to make Oscar dance in the air like a puppet, telling Oscar that he is the cause of her wickedness. Glinda tries to fight her off and begs the Witch to stop, trying to reason this isn't her but Evanora's influence, but the Witch scoffs at this, and says that she'll come back with the armies of the Emerald City. Oscar tries to get through as well, but the Witch coldly states that he is not a wizard, and all their hopes will amount to nothing. As a reminder to Oscar's earlier comment of how witches use broomsticks when they met, she forces away one of the villagers' brooms towards her and corrupts it, and then flies away laughing using the broom as her ride. With war approaching from Glinda's resistance, Evanora along with the Witch of the West prepare their army against the coming invasion. Announcing that they will drive away the enemy, Evanora is suddenly interrupted by the Witch of the West stating there will be no mercy, only complete slaughter, as she demonstrates her much more cruel personality to a surprised Evanora. When the resistance finally attacks, Evanora and the Witch of the West watch invaders coming through the Poppy Fields. Evanora calls out for the winged baboons to attack, but realizes too late that it is a trap composed of false scarecrow soldiers that puts most of the baboons to sleep, despite attempts to escape. However, two baboons manage to avoid this and capture the nearby Glinda, bringing her to Evanora. As Glinda is taunted by Evanora, the Witch of the West witnesses Oscar stealing a large amount of gold from the Emerald City vaults and seemingly flies away with it in a hot air balloon. She arrives in the town square and announces the cowardice and betrayal of the Wizard, showing the hot air balloon flying nearby. She shoots it down, causing it to ignite on fire and pour down gold stolen from the treasury. As she and Evanora are about to finish Glinda, an illusion cast from a carriage appears as Oscar's head. Thinking this to be impossible, the Witch of the West tries to fire at the head, only to have no effect. In response, Oscar sets off multiple effects to scare the witches and believe his power. Seeing the Wizard's might and uprising from the citizens, The Witch of the West attempts to do what Evanora couldn't and kill Glinda. However, as she is distracted, China Girl hands Glinda her wand, and she is able to repel the Witch. Weakened by this attack, the Witch of the West flies off, vowing to return. Oscar states that he knows her evilness was not her doing, and if she can ever find the good in her heart again, she will be welcomed back. The Wicked Witch of the West roars out her defiance at Oscar before flying off.

Trivia
She is similar to Anakin Skywalker because both of them are corrupted by the villian (who is someone they are close to) and they realize their confidante's true motives when it is too late. Her new appearance is like what Oz thought witches should look like (sans the warts).