Deshaun Williams was a security guard at Bluff City Studios, although he quit in solidarity with the writer’s strike (and also due to the series of strange occurrences he experienced during The Moving Pictures).
When we first see Deshaun, it is clear that he thinks he and Bart are friends, and that Bart does not, however by the end of The Moving Pictures the two seem to have a more genuine closeness.
He is a dedicated basketball fan.
When seen in The Moving Pictures, Deshaun is wearing his grey and blue Bluff City Studios security uniform.