Besides the Japanese, Anime lovers consist mainly of white, teenage suburbanite Americans. Also termed "Wapanese" (White + Japanese). They pick up Japanese language as a subject of study not because it is a different language, or even that it is a difficult one to pick up or even for the sake of learning it. They learn it because they're entranced by Japanese culture, and in many ways, they're ashamed of who they are and wish they were born Japanese - believing Americans (not whites per se) to be of 'inferior' culture to the Japanese. They have the belief that all Japanese people are polite and honorable, and still follow the Warrior Code, or Bushido.
They watch anime, own Japanese T-Shirts with rubbish Kanji like "Strength & Prosperity" printed on, frequent websites like J-List for Hentai and Japanese Porn that even Japanese people are afraid to watch or don't even know exist (e.g. scat), collect Japanese weaponry, especially Katanas. Some of them own life-sized Final Fantasy collectibles, and some of them go to OtakuCon and similar things to dress up as their favorite characters. This is known as 'Cosplay' (a form of LARP), and is different than dressing up for a Halloween party. Halloween party-goers don't usually LARP their costumes. They are also known to write fan-fics of their favorite characters, with crossovers from whatever other TV shows they watch. Imagine, if you will: a Stargate SG1-DragonballGT Crossover Slash Fanfic where Goku anally violates Daniel Jackson.
Besides listening to J-Rock or "Glamour Rock" like Gackt, hey also usually listen to goth metal.
Wapanese are typically Star Wars and LOTR geeks as well.