I'm a noob at this, but here is what I have found that might help you out.
You have to go into your RMXP database and go to your MAIN Blizz script. Make sure you have
SNEAKING Animations = false
DEFENDING Animations = false
*If you have them as 'true', the program will try to search for different animations to execute and you will get an error message. If you have them as true, you MUST save other characters with special file extensions. If you have them as false, then it won't need to search for animations.
For example, if your character is Dralel.png then if you have ANIMATIONS as 'true' you must also have separate files and make sure they are IMPORTED into your materialbase before you playtest:
Dralel_snk.png = for sneaking
Dralel_def.png = for defending.
You can change these animations if you want to make it look different, but you don't have to, as long as you have the special file extensions (snk, atk, def, etc), the program will be able to use those. Check the BLIZZ-ABS manual for the exact extensions, cause I don't actually have it in front of me, just going off what I remember.
If you want your characters to actually look like they are moving, then you have to make those yourself, as I don't think the default graphics have poses built into the game. Check around the boards here, cause someone has probably made these things. Not sure where to go for it here.