I know lots of us have different reasons for wearing a mask. Some I've talked to wear a mask simply because they've been told they're supposed to, and someone once told me that we should wear masks so that we know each other when we meet. That's just stupid since ANYONE can pick up a mask and pretend to be one of us, and only a few of us would be able to tell the difference if it came to that. I mean, even the Assassin apparently wears a mask. So there's no sense in thinking a mask will let you know who to trust.
A lot of Anunnaki I've talked to wear masks as a sign of respect for Father because of what was done to him. You know... his face. So they wear masks to hide their own faces out of sympathy for Him. I don't know if Father really cares, but it's a nice thing to do anyway.
And then there's a few of us who know the truth about what was stolen from us, and we wear masks that show the form we would take if we could. There have been very few shapeshifters since medieval times. A lot of them got burned up with the witches the Inquisition managed to pin down. But I've heard rumors that there are a few werewolves and others who've managed to regain that power, and they don't wear masks because their human form IS their mask.
So jealous. :3
The Darklings can also shapeshift... but I've never met any, and what I do know about them gives me the creeps.