I don't have a special interest (I think) but currently, I am interested in ASDs, developmental psychology (primarily concerning infants and children) and the Japanese language.
As for what else I spend time on, there are two things worth to mention.
First is music. I never had the opportunity to study music and so far, all texts I tried to learn from about musical theory were geared towas adults and had this sort of odd or complicated language that I had a hard time understanding.
The other thing might be close to a special interest in that my interest in it is intense and (in relation to the rather small content) "unusually" long-lasting as well as that my way of spending time on it is highly repetitive (but not boring!). There's an anime/manga series of which I like to watch/read some every day.
Other than that, when it comes to interests that involve some sort of activity...
actually, I realise that an interest such as learning japanese involves plenty of activity too, but in my mind, that's not a hobby like doing sports. Maybe I think so because the "intention" of attempting to learn Japanese doesn't change whereas an interest such as "playing video games" or "reading books" is hardly specific beyond the actions of playing or reading but can involve several diverse topics. Even the details of how the actions of playing and reading are performed usually change depending on the subject that is played or read. There's less stability, more change involved in these. Does that make sense?
I might think of some interest really different from others because the ones involving less stability tend to demand a lot more energy of me even though I love doing them too!
Anyway, I love playing video games, mostly rpgs and I enjoy watching anime, reading manga, reading books (mostly for teens/young adults) athough I don't have much time for any of these since I started university last year. Oh, I almost forgot about it but I do kung-fu!
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett