>>396981539
https://booth.pm/en/items/3562410
>>396982950
That honestly depends on the folder/model because some like the M4A1 and UMP45 files are ready to go easy to upload while some like the Springfield and WA2000 files are literally pmx and fbx files. There is a way to convert MMD to Blender to Unity as per this document I found a while back:
https://docs.google.com/document/d/1PEsqdkGgQLMZYzWNLdjkVewTSxUmurTY5qCDa-7iRXY/edit#heading=h.w64nzy9p0ex1