(Although it must be said that in more recent years this sense is mellowing out, to the extent that more Japanese are self-identifying as otaku.
See The Other Wiki's page on this for more info.) A related term is , which refers to a teenager or young adult who withdraws completely from society for an extended period, typically isolating themselves within their parents' house and become psychologically fixated to particular hobbies; hikikomori in media are usually otaku of some sort.
Hikikomori are also critically viewed as lazy and outright creepy, which doesn't help the perception of otaku much - especially after 1989, when serial killer Tsutomu Miyazaki was shown to be both an otaku and hikikomori, leading to a moral panic.
Otakuism is associated with men, with the notable exceptions of the Fangirls, Wrench Wench, the Cosplay Otaku Girl, and creators of a certain kind of comic.
For its use as a visual cue for tradition, see Kimono Is Traditional.
Regardless of other intelligence, an will have an obsessive, unhealthy, and almost encyclopedic knowledge of their chosen topic.
There are almost as many flavors of this type of character as there are things under the sun, but a few of the major ones are: is an adequate translation.
See Qipao for another type of "sexy Asian dress" used frequently in fiction.
Please do not add examples of typical fanservice that just happen to contain a kimono (the kimono falling off or open, kimono used in the same way as a normal robe, etc) to this page.