A lot of players seem to do like me and keep their dupe Eddies for the coming (?) sacrifice feature. This is starting to become a bit of a collection, so let's share what we've got.
I have also kept any 4-5* dupes that have come along. A few of them because it might be useful to have two, and other's for sacrifice I guess.
My collection of dupes currently consists of:
1xStarting Eddie
4xRun to the Hills Eddie
4xMummy Eddie
1xCarriage Rider Eddie
1xWickerman Eddie
7xSpeed of Light Eddie
1xSoldier Eddie
1xWarrior Child of the Damned
1xRocket Dog
1xWickerman
1xCorrupt General
1xAngel of Pain
2xMagus Golden Son
1xAngel of Strife
1xSentinel Soulless Demon
1xAssassin Troll
All in all, that's 19 dupe Eddies and 10 dupe 4-5* allies.