J-12 is a reserved, composed, and rather tough person. He is used to keeping a cool head even in the most dangerous situations and doesn’t like unnecessary displays of emotion. He speaks bluntly, sometimes harshly, with a dry sense of sarcasm. Despite his stern nature, he is caring in his own way: he’d rather help through actions than offer comforting words. He is patient with those he cares about, even if he sometimes clearly gets tired of their antics.