I mainly do, gee, anime! However, when I was in classes, I would do portraits of people in the class in ballpoint pen. I can't sit and just listen in a class. I do better by absorbing it subconsciously, then bringing it back when I need it. So, I've drawn a bunch of people from various classes. I even did one of a teacher who was just about to have tribbles dumped all over his head (in the portraint, not in reality).