seems like the colour scheme is referencing Orthinus from To aru Majutsu no Index NT. she hasn't appeared in any other media aside from a small cameo in a manga so you wouldn't recognise her unless you follow Light-novel trends, now that you mention it; how many other light-novel palette references went over our head?
and i hope we get some more dark-skinned colours aside from colour 5, seems everybody has a similarly ugly dark skin palette; which seems trollish to me.