My least favorite race is Humans. It's just too generic. There are only two creatures, and one of them has a completely human appearance. And all the other levels are basically humans... It gets boring.
But how do you imagine the Human race without humans to a greater extent?:) Humans are generally quite ordinary creatures in life, not just in the game (IMHO ;)), but it would be strange if the units of Haven were... hmm... I can't even think of who could be there instead of the various humans:)