What is the person who gives you information called? Basically I have read a play in which there are two characters that provide you information of the happenings in the play like the information that is important for the play . Now they are not narrators as such but they are normal characters of the play that converse and the readers are acquainted with some significant information? So what can they be called ? Like in this sentence : Salarino and Salanio play the role of ___________ (those who convey information ) in Act 2 scene 8.
P.S. : To be more specific this is with reference to Salarino and Salanio in the merchant of venice by Shakepeare . And i am not happy with the word information tellers since I want a single sophisticated word.