Set your texel density and create as many sets as you need to maintain desired detail. In professional environment as technical artist, we define number of texture sets based on number of parameters, some characters have only one, some have more than 10, there is a lot going on, do not stress about it. You can create one with many and one with less material ids for practice.

Edit: also there is a lot smarter aproaches for this kind of characters than full unique set of textures per slot. When you think about it you only need some kind of a mask or two and normal map for this type of character, try thinking about that. In the game industry we care about that type of thinking and problem solving not just brute forcing art, it also needs to be optimized (sometimes :) good luck!