My 6yo son has Asperger's. (I see the consultant at the end of the month to get a dx for myself).
DS is obsessed with trains, mostly Thomas, but will also watch any programmes involving trains. He likes "Swiss Railway Journeys" for instance
He has a number of fears, he is scared of stickers being stuck on him, scared of masks. He is very visual, so he sees things as they appear, not as they actually are.
He likes routine, if the routine changes he questions why.
He likes to know how things are made, and will take a screwdriver to his toys just to see what they are like inside
He likes eating green foods (so eats his veg!) and wearing green clothes
He is very logical, although his logic sometimes lacks thought. Like playing hide and seek with his sister, hid under her duvet in her bed, but drew a big "X marks the spot" to show where he was, on her duvet (I could totally relate to this ).
If he wants to do something he will become totally absorbed in it, he loves Maths and Computers. If he doesn't want to do it, its REALLY hard to budge him
He struggles with loud noises, and large groups. By choice he'll play on his own rather than socialise. This is the first year he's wanted a birthday party, but he wants it at home, and everyone can look at his maps (he loves maps). I'm still working out how to handle this...
He has other sensory issues, absolutely HATES getting his hair wet and water on his face. Similarly dislikes the feel of certain clothes.
He is not very co-ordinated, nearly 7 and cannot ride a bike, even with stabilisers. Mind you, he doesn't want to either.
IMHO Most computer depts are stuffed full of people with Asperger's, if they only knew it...
HTH