Most of these have great characters who are hardly ever used to their full potential, but I am kinda scarred they will ruin the characters in the new series. I'm just don't want captain carrot or superboy to win.
Joker, for sure. He is a interesting character but every Batman villain is almost as interesting, some even more so than joker. But despite that every big Batman story, even if he isn't the main villain, he is there and quite often he feels shoehorned into the story. And now we are getting hundreds jokerfied heroes from different universes. He was scarier in older stories but now it just feels so oversaturated at this point. It angers even more when I think of all the other amazing villains not getting their own stories because DC wants keep milking the joker cash cow.