Karl Küster (Tod von Freunden)

Karl Küster is a main character in the German-Danish crime thriller series Tod von Freunden (lit Death of Friends, also released as Beneath the Surface in the UK).

Character creation
Actor Anton Petzold was able to speak with an autism therapist to prepare for the role. He also has an autistic friend whom he consulted.

Autism
Karl is first stated to be autistic in episode 1, and it is mentioned multiple times thereafter as well.