Joscha's character model is available in the Director Mode, under the Gangs section as an Epsilonist, also along with the other four people.
Between 29th of April, and 27th of May 2013, anyone could apply to be cast as one of the five Epsilon characters. Joscha was one of the fans selected from the Epsilon Casting Event and is therefore modeled on the likeness of Joscha. [1].