Myshkin is pretty aspie in a lot of ways. The Brothers Kamazarov is a better book overall, I think, and the main character pretty much parallels Myshkin. It covers a lot more subjects and uncovers a lot more psychology. Those are the only two I've read of Dostoevsky, though.
Yes he is. As I said; I think what I can relate to the most in his personality is the incredibly naïve, almost infantile, trust he places in all the other characters of the novel, all of which are fucking scum. But he just doesn't see it. He doesn't get that he's being fooled and taken advantage of over and over again. I can relate to that a lot.
One of my favorite parts is when Myshkin makes the mistake of mentioning to Keller (the boxer) that he's recently acquired lots of good champagne, all of which is stored in the basement of his summer home. Hence, when he returns home, he is surprised to find that Keller and all the other fucking scum of the novel have gathered on his porch. They have - under Keller's lead - broken into his house, stolen all his champagne, and are now busy consuming it on the porch of the Prince's own house. When they notice they've been caught red-handed, they act like they're in fact doing it in order to celebrate the Prince's birthday (which in reality doesn't take place until next day in the novel), so they "graciously" invite him to join "their" party and drink his own champagne. On his own porch. While they're ransacking his kitchen and eating all his food for a midnight snack to go with the champagne. Of course, they do the latter under the guise that they're preparing a "birthday meal" for him.
The Prince remains oblivious to their falsehoods. Dostoevsky: master of what human nature is truly like.
I can recommend
"Crime and Punishment" if you haven't read that one already.
"Notes from Underground" is very good, too. If "The Idiot" is a portrayal of what a horrible torments a truly naïve man would have suffered in Dostoevsky's Russia,
"Notes from Underground" is a portrait of one of his tormentors; one of the men who in
"The Idiot" are referred to as a "nihilist". Check it out and see; a wonderful insight into the mental processes of the worst scum humanity has to offer.