It has been said that every character that appears in a play has something to contribute to the story before he leaves the stage again. From at least one play that you have read, give an example how this could be true.

In the drama "Faust" by J. W. Goethe, Wagner represents the kind of dry academia that Faust hopes to escape. Wagner is satisfied with getting his knowledge from books only. Faust, on the other hand, tries to go beyond merely intellectual knowledge which we see from his evoking the Earth Spirit and later even making a pact with the devil. Wagner, in this sense, is the anti-Faust. His function during the first scenes of the play is to be the contrast against which Faust stands out even more noticeably. To illustrate why Faust is discontent with the mainstream academia of his day. In this way, the character os Wagner helps set the stage for the story that is yet to come and for the tragedy.