PLG

PLG is a Vector Graphics filetype that contains objects and point data, used for many UI elements in Persona 5. This filetype can be found in both ps3.cpk and data.cpk, and within PAC files. Vertex colors can be applied, but are often ignored in certain UI elements, such as the battle portraits.

io_plg
io_plg is a third-party blender plugin written by lipsum which can import, edit, and export plg vectors. It can be found at https://github.com/zarroboogs/io_plg or on https://shrinefox.com/?tool=io_plg