A character from Genshiken. The ultimate otaku.
(or "otaku as otaku can get...")
Madarame Harunobu can go to extreme measures other people (or even fellow otaku) wouldn't even dare in order to satisfy his intense otaku needs, such as not eating for several days to save enough money for his hobbies or even ignoring medical attention when needed.
Madarame is a very thin, tall and tense otaku with glasses, black hair and a short bob cut. He is (probably) the most otaku character in the history of anime.
According to the Genshiken Club's Official Otaku Scale, "Madarame" is the final level of otakuness...