In a world I am building, human and a plethora of aliens have met and they are meeting, but unlike many stories on the topic, this scenario focuses on the individuals; how does Conner interact with xyzikzhidth? How does Bill interact with Đóŧẅen? That kind of stuff. One of the stories features a strapping young lad who has a crush on one of the aliens, but he has never seen even her skin, only the armor she wears.
This has created a problem as I have designed this species, I am struggling to think of a way to dehumanize this species, to make them feel alien, while continuing to keep the humanoid form. I want to create a feel of humanity in them, until they remove their armor, thus I need for them to remain humanoid. How else can I dehumanize them?