Well the wings in their arms and the talons in their arms make it difficult to put guantles and any chest piece long enough that cover the arms... :S
There are no male harpies (at least have never appeared, not even lorewise, it have been stated that there are no male harpies but it was in the RPG book and is not canon, so it could be reconnected)
Do you really believe harpies could be a playable race or is just that you prefer harpies over Arakkoa (everyone prefer harpies over arakkoa :P )