So...this supposed to be my entry for Lombarsi's DTIYS (ended already). There's the original picture from them. The colour change isn't random, many people in Marty's universe have abilities we would call supernatural and this one is called alchemy. And as someone may ask, yes, it's based on FMA, but some things works different and it's easier to use, which allows quite cool things like make a diamond blade from the carbon in air, which in combination with basic telekinesis can be pretty powerful weapon. That's why you shouldn't fight with Marty, he could look weak, but he can kill you in a second with this, if you are not trained in defensive abilities. However great power comes with great price. Those red lines on Marty's shoulder are not wounds yet, but will be once this ends, and it used to be much worse in great battles. Fortunately they also have powerful technology, most of the threats never make it through shields, so battles with personal participation are very rare these days.