I've been working on this for a while now, it's a combined bestiary for the Gameboy Color Megami Tensei Gaiden: Last Bible (Revelations: The Demon Slayer in North America) RPG and the Japanese Game Gear remake of the same title. It's quite interesting, at least to me, to see the monster sprite evolution/changes between the two versions. If you're not familiar with Megami Tensei, the hook for the series is that you can recruit almost any monster you meet into your party and use them as playable characters.
http://www.angelfire.com/ult/ace/RtDS_Bestiary.html