L and Autism: Pointing Out Things No One Else Cares About
A slight disclaimer: no, I do not think L is intended as an autistic character, and I don't expect you to either. This is not a 'diagnosis;' I'm no medical professional, despite the user name, and anyway you can't diagnose a fictional character. You can, however, choose to interpret such a character under the figurative umbrella that such a categorization offers. It is, one might say, simply food for thought.
And I still find it amusing to see how well-liked L is by fans.