The requirements are ill-formed. For example, both glados and wheatley have very articulate and emotive faces replicating many features of the humans. Compared to them, shodan for example would be having less of a human face, despite having the likeness of one. Perhaps you should either consider only entirely unseen characters, like a narrator from stanley parable or AM from I have no mouth and must scream, or disqualify any character capable of articulation.
