I need skins to create the custom trainers, I know where the option is, I know where to get skins for my character but I cannot seem to figure out how to get skins on my custom trainer NPC's. I have done quite a bit of searching on the web, what I have found has told me to download the skins and place them in a customnpc folder which I do not have, one told me that NPC's can use my skins if I type "Custom_NP" I have tried this in the custom section for the Trainer, and in Commands but neither did anything other than give me a black character with purple arms.
Beyond that I have tried putting skins in my .minecraft/assets/skins file, and my .minecraft/recourcepacks file. Neither of which seemed to net me anything.
Other places I have posted have failed to give me any response and at this point I am running out of hope on ever figuring out how to get custom skins on my NPC's, any help is welcome.