Him
He is a visiting Nagarlim genetically disguised as a human. His mission is so secret even he does not know what it is. A tiny chip at the base of his brain supplies information and commands as needed. The chip is slightly damaged.
Her
She is a waitress and keen amateur UFO hunter who rents him a room because he is polite, quiet, and always ready to listen with an open mind when she talks to him about UFOs.