Little gray aliens aren't people, no matter how well they fake it. They can be domesticated, though. Might as well keep them around, right?

"My name is Karkat Vantas," you say when the recording starts. "Imperial ID number 4136-1211-15201. I'm applying for status as a pail slave. I'm," you swallow hard to try to clear the lump from your throat, "I'm unfit for standard contribution due to abnormal hemotype, but I want to serve my Empire to the best of my ability. I understand the physical demands of the position and," your voice cracks, "I'm training to be better prepared for them. I swear to cooperate readily and faithfully with my assigned user. I surrender my body to Imperial custody. All hail Her Imperious Condescension, and all hail her glorious Empire."

Homo sapiens domesticus Humans (Homo sapiens domesticus) are short-lived primates of the family Hominidae, and the only existant species of the genus Homo. They originated in Africa, and spread to other continents of planet Earth within a megavorn. While fractious and warlike in their wild state, they are easily trained to a useful function.