See this is the problem. A lot of fans think and are convinced the Emperor's inner circle aren't human. Others don't, and the reference materials are often little help and conflict with one another if you've spent much time with them.
We need more consistency among the printed reference materials, online sources and the Expanded Universe to keep things a little straighter than they usually are. Growing up I tended to assume the Dignitaries surrounding the Emperor were humanoids and not simply human based on their somewhat paler, more gaunt and exotic appearances but hey, I could be mistaken.
The important thing? We have action figures of all but one of them, and the other is likely coming in the not-too-distant future.