, the ugly one.jpg
That's true. In general, young anime characters are fit/slim for 3D standards and we have to rely on their own judgement. However, they sometimes are clearly made to somehow look like shit for narrative purposes, which include a loner or self-abandoned lifestyle (Tatsuhiro Satou, Kuroki Tomoko, the original Genshiken...). In that sense, I think Jun is portrayed rather nicely; he also have conventionally nice and manly facial features unlike, say, his boss.