Homunculus

The word Homunculus (homunculi for plural), is latin for "tiny man" and was used in 16th century alchemy, and later in 19th century fiction on alchemists. The first use was in the writings of Paracelsus made in 1493 to 1537. They are described as lanky men with receding hair lines, the size of a fetus, made by incubating special human sperm cells in a horse womb while changing the horse blood out with human blood. In dungeons & dragons they are instead sculpted from clay ash and mandrake root, then given human blood with a jewel encrusted dagger. They are able to look like anything you sculpt them to be, as long as they're no bigger than a two and a half cube and have appendages that let it fly.