Firestorm and Cyclops
I was glad to see Firestorm featured in the promotional material for the upcoming Justice League Action series.  I always thought that he was a curious omission on Justice League Unlimited, I'm not sure why he wasn't featured there, given his history with the League in the comics and even on a previous animated outing on the later seasons of Super Friends.   

https://braveandboldlost.blogspot.com/2016/08/firestorm-and-cyclops.html