Felt-tip pen
would have worked, and be less permanant
Nintendo's AR cards, which trigger the augmented reality functions on the 3DS, have had their fare share of custom implementations. We've seen the design reprinted on t-shirts, drawn on blackboards, even scaled up to the size of a tennis court. Now, one shameless net-nerd has taken it a step further and made the AR card a …
God forbid the guy put a tattoo on him that he thinks is cool. I've seen tattoos of garden gnomes, human organs, R2D2, and even the Cheetos Cheetah. So what if this one person has that particular tattoo? Im sure he's happy with it and won't feel bad when the 3DS dies and he moves on to something else.