How did the wicked witch of west become wicked?

There are many different stories about how Elphaba Thropp, the Wicked Witch of the West, became wicked. One story says that she was born with green skin and pointy ears, which made her an outcast from society. She became bitter and angry, and eventually turned to witchcraft. Another story says that she was once a good witch, but was corrupted by her desire for power. Whatever the reason, the Wicked Witch of the West is a powerful and dangerous foe who should not be underestimated.