it's been a while since my last post but here Death note headcanon - theory: Light is on a spectrum.
It's been proven that L is undoubtedly autistic. But such a theory has never aroused about Light, and I think it's a big loss. So, it was scientifically proven that neurodivergent people's brain receives and process information differently but Light shows many times that he understands L's logic and process of thinking far too many times which could serve as a prove that they could share the process of thinking. I mean, skillful experienced people from the task force, who were on police duty for many years couldn't do that but Light could.
Light has black-white thinking. Black-white thinking is also one of many characteristics that could be associated with autism (I'm not saying that every autistic person has to have this feature). However, it is an arguable matter because Light found a death note at the age of seventeen when his prefrontal cortex wasn't fully developed yet when he was prone to such way of thinking due to neurophysiology and died at the age of twenty-three without his prefrontal cortex being fully developed yet, meanwhile in cases of most people prefrontal cortex usually develops at the age of twenty-five or even later.
Hyper fixation. The desire to change the world (which solely could be based on black-and-white thinking could hardly be called a "hyper fixation" but in Light's case, I think it would judging by the fact that he was ready to give up his life into service of the goal he created for himself.
Lack of interest in intimacy/personal life. This also could be attributed to strong hyper-fixation showing that Light has a lack of understanding and urge to experience human basic desires that could be connected to his strong hyper-fixation.
Fatalism. I honestly don't know if fatalism could be applied to autistic features but it's an interesting detail about Light's character. He is a fatalist, and he sincerely believes that he is a chosen one despite Ruyk telling him that he isn't special, that he hasn't been chosen, it's just a coincidence.
