One thing I have to add, I've never heard of Indigo's before I came to this website. Prior to this website I learned from the Ra channelling of the Law of One, found at
www.lawofone.info, that who you refer to as Indigo's are called wanderers.
Wanderers are either a 4th, 5th, or 6th density conscious soul incarnated in to a 3rd density body. Basically, they aren't natives to the earth sphere, they evolved on some other planet and decided to incarnate into earth to help. Hope this helped out.