What books are the characters in The Movement from? I've seen Katharsis in Batgirl, but am unfamiliar with the other characters. Are they original, or have they appeared in other books before?

Katharsis is from Batgirl, Rainmaker (not an official member at this time, but definitely in proximity) was originally a member of Gen13. 

The rest are new to the book, but a couple might have connections to previous DC characters!