Not Stalker's issue. xD

Actually though, I think KRay would be a far better character is [@Bartimaeus] focused him more on the drug thing and the injector gun. The Tattoo manipulation seems an unnecessary add-on, and seems out of place; more like a random addition than anything that clicks with the character. I'd have replaced it with Kray being knowledgeable on various plants and poisons, and having altered his body to have less negative effects and more positive ones, and the opposite for his opponent. And perhaps having a 'blank slate' type of drug, where Kray can add any item(like wood, or so) into the mixture for varying effects(Concrete into the blank slate, weighs down the opponent for x amount of turns.)