A JSP is a secret format for storing sprites created by Mike Hommel. It is only a recent thing that you can edit them and create your own. If you have Dr Lunatic or any other Hamumu Software game which either has Bouapha, Kid Mystic, or young Dr. Lunatic as the protagonist, then you can find these "JSPs" in the games graphics folder. These JSPs, as mentioned above, store sprites of different "monsters" used in Mike Hommel's 2.5 dimensional games.