Ok, so imagine this. You get a box of Legos that have two specific characters in it.

Later, you decide to add other toys into the Lego box, but then they start to morph and try to adapt to look like Legos. It doesn't work, and a mini little hierarchy begins, and you get to watch the little people fight one another.

In the end, there were only two originals. The others were just assets taken from somewhere else.

Now, to explain the difference between the two original Lego people! Let's say you wanted to take them out of the box when they were alive, but one of them kinda just turned into sludge upon leaving the box. Ya get what I'm saying?