I would try Beauty and the Beast. (Possibly because its one of my favourites- just stay away from Disney interpretations!)
You could easily switch it so that he is isolated not because of a physical deformity but because of his social difficulties. He has a special interest in roses, hence gets very upset when someone takes one without asking. Even when Beauty comes to stay and keep him company, he only really sees her at dinnertime and even then he doesn't eat with her. And dinner itself can become a ritualistic behaviour, asking her the same question every night. Eventually, Beauty learns to see past his strangeness and comes to care about him, because he is actually creative and gentle and cares about nature. Personally, I would not have him changing into a normal person at the end like in the original, but rather he is saved because someone accepts him for who he is, and he is no longer forced to be alone.
But I am, and have always been, a sucker for a romantic story.
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Your neurodiverse (Aspie) score: 149 of 200
Your neurotypical (non-autistic) score: 73 of 200
You are very likely neurodiverse (Aspie)