Hi Mokilil, thank you for using my code!
Are your definitions and script structured something like this? (These same lines can be used in my game project for testing)
I added spacing in the image name after "f", so you don't have to manually hide them constantly when switching to another image for the same character, but that is a matter of preference.
Maybe it's not working correctly because your ford and waynely models don't have the paramMouthOpenY parameter named the same way in their json?
A quick-and-dirty way to fix this is put in all the available namings you have like this in the live2d_lip_flapping method (this is just the example with hiyori and Epsilon but might not be universal). All the Ren'Py versions I have tested so far allows it, even when model doesn't have a blend_parameter with a particular name. Then you can remove the param_mouth_open_y_label parts in the code too because it's redundant.
