Micron pens (sizes 005 to 08). I don't like how the cross-hatching came out. I'd write more about it, but it's fan art for the Super Mario Bros franchise. I can't go into some lengthy description/attempt to validate my choice of subject matter without sounding like a jackass.
He is a horrible, mean, and awful man. Casey is often seen grimacing at kittens and shouting "STOP LIKING THINGS THAT I DON'T LIKE!" at passers by. Seriously, stay away from this dude. He's mean. For reals.