Today, I have found someone has developed the Android Theme with Masked Rider Wizard. However, it is all in Chinese. I have tried and used it. Unfortunately, I can only succeed in using the QQ version but not the 91 ver. Thus no lock screen theme with Masked Rider Beast :-(
Step 1: Find and install the app called "QQ桌面" in Android Market.
Step 2: Download and install the file from the link below.
Step 3: Open the "QQ桌面" and click the menu button.
Step 4: Find the button called "Theme"
Step 5: You can found the Wizard Theme and applied it.