@knight_evangel his character goes along with the story, people who are treated as missfits by society, the author makes good use of the principle of "show dont tell", since while its obvious this guy has a mental disorder, its not clarified if its a spectrum of autism/schizoid personality/alexithymia or something along those lines, only the abuse he suffered, but that on itself doesnt mean that the message was well delivered on THIS narrative.
If I had something to say against it, it would be that all the character so far are related to one another in someway and their intertwined background is build up by how they overcome their hardships together, except for this guy that came out of the blue. The theme that the author was trying to touch was a good one, you could build something interesting as the others, but it felt rushed, my guess it had something to do with the editors and how you cant fit all you wanted in a project, so the result is plot that the audience feels is just an afterthought.
Nevertheles, I like it for what is worth