In the play endgame, what makes hamm and clov different from typical dramatic characters?

In the play Endgame, Hamm and Clov differs greatly from typical dramatic characters. Hamm is considered a protagonist but he has an unlikable characteristic. Clov is also a protagonist in the play, yet he has a characteristic that differs from typical dramatic characters in which he is a servant and he wants to leave his responsibility as a servant. He desires to leave Hamm. 

the maximum speed limit is 55 mph on a two-lane undivided highway and for vehicles towing trailers.

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for the pts back! merry x-mas!