A otaku is a person, usually
male, watches SERIOUS anime. They usually stay in the comfort of their home but come out when there are expos. If they do reach these expos, he/she will probably spend their whole life's allowance on:
Squish pillows, manga, super rare colectibles, and chibi figures. When at home, they will have most of their job money put on trying to hold on a subscription to things like VRV or Funimation (also Crunchyroll!). A otaku ranges from 5 years old (keep on watchin'
Pokemon.), to mature level, which is like
17 or older.