Hi! Out of curiosity, can you link to one of those characters with high resolution textures you're refering to? If the goal is to create a game character, I would rather look at actual game assets for reference. In both Unity Store and Unreal Marketplace, you should be able find sample projects. Can use those to learn from…
First things to consider are. What do you see of that character at any given time? Usually a character in most games doest have a super even texel density, unless they are always seen at the same distance. Meaning, in a fps game you will likely have lower arms and hands at significantly more texture resolution than the…