I wouldn't say it's weird. Infact, I think, myself, that it's a very common trait among aspies. Ofcourse, I'm only saying that because I do it to. It's pretty much a form of Roleplaying. You take up the role of another person/character, and act the way they would act. For me, I always used to be called "Etular" and act as this elitist, snobby person online despite being a naturally kind person. Upon first playing World of Warcraft, I heard of these so-called "RP realms". I decided to join and, upon eventually learning what they were, I found a place I could act out this alter-ego personality as if it were real. Etular Fizzlebomb is his name and, as guessed by the surname, he's a Gnome. The problem being, I'm often criticised out-of-character for having a "mean gnome" when "all gnomes are nice"... Also, many a time I am suggested to take a different course of action, but then I reply "But that isn't what Etular would do". Even outside of RP, on other websites/games, I call myself Etular and often express 2 opinions - What I would do, and what he would do. The list goes on forever of what I do involving the alter-ego Etular, but it's not as weird or unique as you think - I assure you.
EDIT: For more information on the topic of "Roleplaying", look here.