I'm sorry to say, I don't have an account on the Curious George Wiki and I currently have no plans to get one. Even if I did, there wouldn't be much I could do as a non-admin user other than report him. Have you reported him yet?
It's very simple. You just leave a message on an active admin's talk page, telling them that a certain user is vandalising the wiki, and you need their help to ensure this vandalism does not continue. Be sure to include the username of the vandal with a link to his user page, as well as a detailed description of his vandalism in the message.