While there are some stereotypes, the American otaku is just someone who enjoys anime and manga in great detail, though not obsessively so. They may care a lot about the differences betweentsundere and neo-tsunderekko, or possibly the different types of “dere”. There is a social stigma due...
you may think of someone who dresses like it is Halloween every day and talks in a weird way. But these could just be biased views or stereotypes of Otaku. Well then, what does “Otaku” really mean?