In addition to the ability to buy it in Japan and play it in Japanese, there are additional benefits to Konami's Japanese localization of Scribblenauts. Specifically, you can use the power of your words to bring forth Konami characters into 5th Cell's world.

In these screenshots, including one tweeted by Hideo Kojima and two from Hachimaki, you can see Scribblenized versions of Old Snake, Gradius's Vic Viper, and Love Plus's Manaka Takane. Apparently, the other two Love Plus girls were left out for some reason.