Thread:Coolot1/@comment-30134917-20181114190500/@comment-30134917-20181206224336

A'ight. Well, for the series, what you need to know is that one by over the course of around a hundred years, eight humans (presumably all children) fell to the Underground and their souls are represented with different colors. If you're curious and wanna know more, here's a page from the Undertale wiki talking about the human souls and what they do.