I once met a person online who claimed he had been diagnosed with Asperger Syndrome, who actually didn't.
He did have a special interest which was Japanese culture, and I got on well with him in that I listened to his anecdotes about his girlfriend and the stuff that he does in Japan. He knew a lot about Japanese culture, and I was able to engage in such conversation as I was interested in Japan to a degree as well. He said that he was half Japanese-half American, and that his mother got raped in America at 18 so he never got to meet his father. He then said his mother gave him up for adoption early on to a Chinese-Malaysian man in Queensland because she was too mentally traumatized from the rape and was unable to look after him. It was here in which he was "given" an Anglo-Saxon name. He said he's thinking of becoming a businessman in selling cars. He also said that a "scoutman" (headhunter for pornographic films in Japan) wanted to pay him 200,000 Yen to feature in a Japanese porn shot, coz his Eurasian appearance was considered very attractive to Japanese audiences. He bitched to me about his girlfriend was selfish because she was unable to drive him to the barber (for a haircut) on his birthday, despite the fact that he can drive himself.
HOWEVER, I spoke to his girlfriend who told me that he was faking his identity the whole time. He was actually a Caucasian Australian from a country Victorian town who dyed his hair brown and claimed to be mixed blood. She showed me his REAL Birth Certificate and his REAL driver's license which showed his Anglo Saxon name. She knew that he was faking his identity coz when she wanted to ask him further details about his family, real identity, or his exploits in Japan, he'd get very irate and tell her to shut up, like he has something to hide. She happened to meet a few of his other friends in Melbourne (by checking his mobile phone), and they told her that he was just a regular Australian with none of that rape-story behind it. She obtained the contact details of his REAL family that live in a country Victorian town and his dad was laughing, saying that he was putting up a "big show".
This guy doesn't know that she knows that he's faking it. She predicts that if she were to be upfront about this whole "half-Japanese" facade, then he may become crazy and suicidal and hurt himself.
I was very grateful for the girl for telling me about all of this, because as an Aspie, I have a pet hate for dealing with phonies who take advantage of my Aspie trustworthiness and innate naivety, and I didn't wish to waste any further time talking to people like this. I was extremely angry that he was lying to me the whole time, knowing that I had Asperger Syndrome. But at the same time, I realize that he does have some sort of delusion with his identity, and is so fixated on living a lie, and that he needs SERIOUS psychiatric/psychological counselling.
I therefore suspect that he has some sort of severe personality disorder, "Borderline Personality Disorder" or "Dissociative Identity Disorder" perhaps?!?! 