I have finally figured out what an Unbirth is. (Note: This is based on deductive reasoning and speculation so cannot be taken fully as fact.)
Ok,
First, we need to look at the Unbirth that Ven fought in the Enchanted Kingdom (Sleeping Beauty's World). Now if you remember: Maleficent put a curse on the on the wheel spindle that spins wool so she could put Aurora to sleep. In the game we can assume that this story holds true as well. The way Maleficent would do this in the game would be to pour the power of Darkness into the Spindle and have it put her to sleep.
Now,
The released image of Ven fighting the Unbirth known as the Wheelmaster shows us that it is probable that the latter boss (Wheelmaster) was conjured to fight Ven out of the Darkness that was poured into the Spindle Wheel!
Next,
Nomura has stated only a few hints as to what the Unbirth are until now but one of the hints piqued at my interest for a long time. He said that the Unbirth are supposed to be, "the opposite of Human life". This means that they would either be some negative by-product of a heart being born or...
The Unbirth are born out of inanimate objects that are filled with the darkness of people's hearts. The unbirths we've seen so far are the Wheelmaster and the Red-pot unbirth which both are derived from inanimate objects like the spindle and an ordinary pot. When the dark will of people's hearts takes control of ordinary objects, an Unbirth is (paradoxically) born.
Finally,
This theory holds with the idea that the heartless only began to spring up when Ansem's research allowed for their creation. The equation then becomes simple:
When a person's heart becomes filled with darkness -->
a heartless is born
+ if the person has a strong heart and will a nobody is created from the empty shell that their body leaves
+ if a person becomes so filled with darkness that darkness is transferred out of them into the objects that surround them and allows these objects to act of the instinct given by that dark will.
Thank You, thank you.
It took a lot of research and deduction but from what i can see, this theory is pretty solid. Enjoy KH wherever you may be!
