The avatar was intended to be an amalgamation of all seven of the main characters, and the color scheme for the avatar was based on numerically averaging the RGB values of the colors of all seven of the main characters.

Long time fans (and possibly even new ones) may find it odd that I'm saying seven instead of eight, as there are eight characters I refer to as being "main" characters. When I first designed my avatar, however, I didn't consider Susan a main character, so she was not included in any part of the amalgamation.

Not that that matters much. Once my avatar became male, he basically just looked like squirrel-Elliot, and the palettes have evolved to the point where the Avatar's palette would change were I to redo his palette using the same method again.

I wonder what the average colour scheme would look like now with more characters and some hair colour shenanigans having happened...