I have featured aliens in some of my stories, and called them the Pegrasons. They like humans because we are so easy to enslave and our genes so easy to alter. They were the height of humans with slender, lithe limbs. Their ears are pointed, their eyes almond shaped and their tongues longer but thinner than ours. Their skin shade varies from glossy black to midnight blue. Their clothing tends to match, and is tight and shiny. They are either bald or have long, waist length clusters of hair, a bit like uber-dreadlocks. They speak through clicking sounds. They have a slave owning society and like modified humans as sexual pets.