@takashi02 actually otaku is a word you use for really obsessive manga or anime fans. Fans who dress up as their favourite character 24/7, who horde huge amounts of merchandise and so forth :) otaku is a word for a very very committed fan. and I don't think cosplay is under the category of otaku :)
@takashi02 yeah if you will, just you're doing it because you want to bring that character into life and kind of act and pose like him for pictures... I guess the line is really thin between being an otaku and dressing up for Halloween xD?