You simply need to assign a different material than the default mat_model/ Gouraud shading. I would give you a small pixel shader but I see that you are using the free version of A8 (which does not support shaders).
You can still use some fixed function effects which should easily be able to just render the base color but sadly I don't know how to write them (maybe a new thread in the shader forum?).

Alternatively, you can try to create your own material (with the emissive_blue/ red values and so on, maybe try and set all of the others to 0), or use the LIGHT flag (and possible the UNLIT flag, too) to tint a white base skin.