Divana

An envoy from an Imperialist Alien Empire, came to Earth to survey the planet for their imminent invasion. But alas, she lost all of her crew and translator. I told you, Korinth. Fix the damn hyperdrive already.

Now, taking a human girl's form and their gender, she lives in your house, teabagging those mean kids in online games...

Warning: She can't speak a word of human language.