Literally the earliest goblin race on record, and almost entirely unheard of as a result of Spontaneous Goblinism. Lean, greenish tinted skin, pointy ears, with slightly oversized heads and little to no hair. The defining characteristic of True Goblins is wit. Figuring your way out of a situation with available data, get a Goblin. Coming up with an off the wall, seemingly unrelated solution that is still an answer, get a Human.
While true Goblins breed true with humans, their offspring are also highly likely to be born with some characteristics of their human parent: more head hair, fuller figure, more muscle, and so forth. These traits tend to show for about three generations, and then average out with the general Goblin appearance set.