The new Rocket Red from just before Flashpoint carried over into the Nu52, but then they killed him off.
Captain Atom had a mini series back in 2017 that undid all the damage done to him in the Nu52 series where they turned him into a total Doctor Manhattan Lite rip off. They got rid of most of the Nu52 added garbage and reset him pretty close to how he used to be. I don't know if he has been seen since that mini though.
For my answer I am going to say the Legion. This Bendis version is just a sad knock off version that can't hold a candle to most of the previous versions.