Markovia said:
While the Wizard can be quite kind at times, he honestly is a bit unscrupulous, and has no powers of his own, and thus mooches off others' work. An ordinary man who came to OZ purely by accident, the Wizard now finds himself trapped in a kingdom under siege, with many people thinking that either he has some plan to save OZ, or is acting out. He has absolutely NO idea what he's doing, and is terrified that he'll finally be exposed as a fraud. His only hope is that someone (ie, the PCs) will step in and do his job for him...
Also, the Wizard inadvertently angered Elphaba when he convinced her to use the "Grimmiere" to create quite a few things that ultimately led to the creation of such things as the flying monkeys, the flying broom, etc. for his own benefit. However, when Elphaba realized what was going on, she took the Grimmiere, the Broom, and the flying monkeys and ran. In response, the Wizard declared Elphaba a "Wicked" witch, and waited for her to either come crawling back for a pardon, or be killed. Unfortunately for him, she did neither, and he had to send in some girl, a heartless tin man, a stupid scarecrow, and a cowardly lion to defeat her. However, a bucket of water isn't enough to kill a witch! They should have AT LEAST sealed her remains in a mirror-lined box! They only realized their folly when she began attacking OZ with a renewed effort and a new ally... the Rotten King!!!