If they get support for years, strongly autistic people get better with their day-to-day life.
A strongly autistic person may be able to do things others aren`t able to.
As for the lack of realism there would be in having an autistic superhero:
A: Our world is more surprising than is claimed. (Nature is full of insanely imaginative animal species, like the so called zombi-worms.)
B: It wouldn`t have to be a realistic superhero-story.
Why not have the autistic one have someone to look after them? Maybe a robot assistant?
I would love to see that kind of comic.
"Sanne Aaij is a dutch autistic capable of fitting inside a cookie jar, shooting electricity out of their brain and other kinda normal stuff. With her robot assistant, she fights against her greatest foes: Social interactions, daily routines and the last hybrid-dragons."