Board Thread:General Discussion/@comment-31371445-20170222233857/@comment-31536324-20180710035203

"Also, a note to myself before I forget it:

Soul modes are the specialized magic of monsters being applied to human souls, temporarily giving them the ability to use magic."

The former part actually does make sense; but the latter is mitgated by the intro, and the books that mention what's in the intro. The phrase about humans never knowing the joy of expressing themselves through magic, once again, could just be an allusion to human's being unable to have a white soul; since SOULS are a tangible thing in Undertale it does make sense that monsters (at that time) would be prideful over that.

Since Ball Game gives credance to the idea of each color of the human soul (Red, Orange, Yellow, Green, Cyan, Blue, and Purple) representing a different trait, and a soul having all traits, but being colored and granted magic (both the intro and books explicity say and imply HUMAN magicians) according to the most dominant trait. (We see seven human souls in these exact colors after all.)

And you can't really say the intro itself isn't canon, since the information in it (at the start of the game) is mentioned and elaborated on in the game itself. Whereas Flowey's changes are not, and never even referenced afterwards to boot. Same with Mettaton's changing of the title.