Um, I was thinking about writing a fan fiction about Jim Raynor. At one point, he would come into contact with a Xel' Naga. Incountering this creature would give him new abilities, and a few changes to his looks.
What do you think he would look like? I think might have glowing markings... Too cliché?
I'm thinking mayby you could make his blood color different, or it might emit light so we can see the blood veins in the dark (not really practicle in tactical situation, but it's not the point) He could be cut once in your story and he would notice the different color of the blood. Just an idea.