Ben X (2007)

Amazing Belgian film about an autistic sorta emo guy. The novel itself, "Nothing Was All He Said" by Nic Balthazar, was inspired by the true story of a boy with autism who committed suicide because of bullying. In 2015, the film was adapted into a graphic novel, drawn by NDurlie READ IT HERE!
Haven't been able to rewatch it since i can't find a streaming service where it's available in my country, do let me know if you find it!
I also tried out the revival version of the MMORPG he plays in the movie (Archlord -> Archonia) might make a different recommendation entry for it.
WARNING: Themes of suicide, bullying, loneliness, delusions, etc.

Genres: Drama, Suspense

Official Movie Website (Includes trailer)
The Archlord website for the film at the Wayback Machine