So, I've found he's the most difficult character to sort out, and it took my a while to work with him, but I think I'm pretty happy with him now. Here are the sketches and inked up designs I worked with.
I forgot to save the base colour image, so let's just skip to textures: here are the 10 different versions I chose between.
I then chose my favourite textures out of those designs and put them together in a final texture lay up, which I then shaded under. So this is my final Xander design (though it will be redrawn slightly)
Giles and Spike to follow :)