User blog comment:Precurefans11/Cure Echo is a cure in Smile Precure?/@comment-4914358-20120327222123

In my opinion, it would be great to see her in the series. And if you see a picture of the Smile Pact, you may see this:

Pink - Happy

Orange - Sunny

Yellow - Peace

Green - March

Blue - Beauty

And the other two colors (Orange, Purple) are probably other 2 cures, that's what I heard