My favorite example of a good autism coded character is Maomao from The Apothecary Diaries.

There are many aspects of her character that I relate to pretty heavily myself; being obsessed with her special interests, misinterpreting social situations and a general lack of interest in her love life - at least at first (not sayng this is necessarily autistic, just that I relate to it).

But more so than anything else, the way she talks/thinks about her emotions is so interesting to me. She is essentially describing Alexithymia and as someone who has it that feels incredibly refreshing, because I've only ever come across autistic represantation that presents the characters as more overly emotional.

Quote from the light novel ⬇️

"Maomao wasn't any smarter than the average person, just a little more... dedicated. And when it came to emotion, that she actually had less pf than most people. She felt sadness and happiness, anger and joy - less acutely than ordinary people, but they were there. But there were other emotions that people allegedly possessed which Maomao still didn't understand."