Mostly stuff about the filesystem and procedures I use to get assets, specifically models.
Make sure that you have the RomFS of Yo-Kai Watch. In there, you should have a file named yw1_a.fa. This file contains all of the assets that aren't sounds or cutscenes. Use Kuriimu2 to extract the contents.
Once extracted, the character models will be in data/character. The .xc files are openable with a tool of your choice. I personally use the Studio Eleven Blender plugin, but Metanoia is another good choice.