Hahaha, I finally was able to find the Vexen Shimeji. It took forever. He's so cute and the person who made him did an amazing job.
I do not own this shimeji. I just simply took the shot.
I have the link set up, it should download now.
Kingdom Hearts: Vexen Shimeji Here --> [link]
The .zip only has images it seems, I can probably alter them, but you can just copy a shimeji's folder that you have already and replace the img files with the Vexen images.
It will work fine, I've done it with many of shimeji I have now.
Vexen (c) Square Enix