The others that are separate (for female classes) are Guardian, Tamer, and Shai. For any class, if you want to know the body texture they are using, just open up the <class prefix>_00_nude_0001.pac file in 3D Object Converter and view the material information, like so:
View attachment 143014
Now, this is not for the faint of heart, but you technically could give separate body textures for the classes (like Kuno shown above) that share their body textures with another class.
Let's say you don't really care about male classes, you could use UndercoverPervert's pactool to change the texture used in the nude file to a male texture. Then you replace that male texture with your custom-fingernail-colored body texture (along with a few other textures used for normals, specularity, etc). I haven't tried this specific use case out, and it could possibly lead to some weird results (zerkers with big nipples perhaps!), but I think the theory is sound.