Yeb Wakab

Yeb Wakab is the creator of the Pencilcosmos, and the creator of most things inside it. Yeb Wakab is rumored to look like a pencil by the Pencils.

Before the Pencils spread rumors and disinformation about Yeb Wakab being a pencil, most creatures didn't even know that Yeb Wakab existed, with the few that did referring to it as "The Original". However, the Pencils were quick to catch onto this, and tried to make others believe that Yeb Wakab was a pencil, in hopes of making themselves look even better.

The Markers realized this, and tried to stop the Pencils from doing this, but then the Pencils made everyone believe that the Markers were possessed by the entity that had created The Hole, and thus many civilizations worked together to erase the Markers from existence and make them go extinct.

After this incident, almost all of the Pencilcosmos (except for the Zgazl) believed that Yeb Wakab was a pencil. Sadly, Yeb Wakab didn't do anything about it.

Origin
Yeb Wakab has been in the Pencilcosmos since its creation, and possibly created the entire space itself. It definitely created everything in it.

Foreign Cosmos Theory
Yeb Wakab possibly arrived from the Hole Monster when it either started eating an empty cosmos, or just had a head connected to nothing. Yeb Wakab, with others of its species, created a new cosmos outside (or on the end of the unattached head) of the Hole Monster. They were members of a more powerful race in a more powerful cosmos that was destroyed by the Hole Monster, and travelled to the Pencilcosmos, but only Yeb Wakab survived the trip. Yeb Wakab was left with no other life in an empty cosmos, and so it would be logical to fill the place with different civilizations.