I'm back with another post related to ParaParaParadise 2ndMIX, and this time it's for the models in the game.
The below zip file has a mix of .gtx and .mbd files. I assume the .mbd files are the models and the .gtx files are the textures, unless I've got them backwards. Either way, these are used by the game when it displays the characters on-screen.
BUMP #2 (August 2021): I know me constantly bumping posts is annoying, but if you're wondering how I got those files: gobbletools by 987123879113
In the folder "viper" is a tool I used called "ppp2nd_dumper.py", which dumps files from the PPP 2ndMIX HDD file with the proper filenames. This tool requires Python.