Board Thread:News and Events/@comment-933831-20150130085805/@comment-25924729-20150130115858

Makes sense that the 7 (or 8) Spectrum members will be based on the colors of a rainbow, given that a full spectrum has 9 colors. (7 rainbow colors + black and white, possibly without violet or indigo as they are very similar, making 8 colors in total.)

It can also be assumed the 8 members will have names with initials that can spell "Spectrum", while also relating to colors. Much like regular OCs and the color naming rule.