The monster hunter PRC's list of favoured enemies list appears to be missing a number of primarily humanoid races with the curious exception of half orc.
This is either a bug as the list is incomplete, or the bug is that this restriction isn't noted in the wiki or the class resources on the forum.
Given the gothic horror themes of the corruption of man, the exclusion of human from the list seems particularly jarring. It's also not clear if this interacts witth Studied foe, eg if you pick up favoured enemy human via ranger, if the undocumented restrictions on MH mean it won't function.