The main difference between public speaking and conversation is:

The main difference between public speaking and conversation is SIZE OF THE AUDIENCE.
The size of audience for public speaking is usually bigger than that of conversation, conversation usually involve very few people. 
The other differences are these: for public speaking, the tone is formal, the speaking is more sturctured and the delivery mode [posture and loudness of voice] is formal.

Agood classical drama is shakeshere's  a midsummer's night dream.  i think that puck is certainly a protagonist. puck sprayed the love potion in the wrong persons eye, he thought it was funny but he fears oberon. puck is only mentioned a few times and doesn't have as big of a role as other characters.