I don't really think a MC sprite is necessary or would make a good difference, personally I like a mcs without a sprite so that way we can picture ourselves in the situation or at least have a better grasp on doing it in certain moments of the history, and the first-person POV makes it really easy to do too.
But that's just a personal taste since a MC sprite wouldn't probably fit with everyone playing, so leaving it to the reader's imagination is a better move imo.